Compounding Flashcards
what is traditional compounding
process of combining or altering ingredients to create a medication. It is prepared by a pharmacist for an individual patient NOT in bulk. Not FDA approved. the dose or formulation is not commercially available as a manufactured product, so it must be compounded.
Who is USP
U.S. pharmacopeia - set the standards for compounding (ex: 797,795, 800
USP 797
minimum acceptable requirements for sterile compounding (797 is higher than 795, which is nonsterile)
ex: eye drops, IV drugs, ear drops, irrigations (something with antibiotic in it, used to rinse off affected areas), IM and SubQ drugs, Eye drops, Irrigations, Pulmonary inhalations
USP 795
minimum acceptable requirements for non sterile compounding
(ex: orals, topicals, nasals)
USP 800
USP sets the minimum acceptable requirements for handling of hazardous drugs (HDs)
USP doesn’t determine which drugs are hazardous. the NIOSH does (national institute for occupational safety and health)
pharmacopeia
a list of medicinal drugs with preparation instructions
API
active pharmaceutical ingredient
everything other than this is the excipient
aseptic
“free from contamination”
Hazardous criteria
carcinogenic, teratogenic, causes organ toxicity , genotoxic (damage dna and can lead to cancer)
all hormones are hazardous drugs
prior to handling hazardous material, hospital staff must do what
if they are of reproductive capacity, they have to confirm in writing that they understand risks
Reasons for nonsterile compounding and types
prepare a dose/formulation thats not commercially available, to remove an excipient the pt is allergic to, to add a flavor
usually for drugs administered by mouth, rectally, vaginally, topically, nasally, or in the ear
types:
simple - follow basic instructions (most of what we do)
moderate - requires calculations
complex - requires extra training/equipment
T or F: non sterile compunds require a hood
False. These can be made in room-air, but should be separated from the dispensing part of the pharmacy. They dont require a hood.
T or F. Ingredients used for compounded can be stored in boxes on the floor as long as they are labeled.
what else is required of nonsterile compounding spaces
false. all equipment, containers, and components must be off the floor.
The space should be clean and well lit with proper heating and ventilation to avoid drug deterioration.
There needs to be adequate plumbing and two types of water.
- potable - (tap water) for hand washing and cleaning equipment. sink should be easily accessible to compounding area, there should be soap, detergent, and a method for hand drying.
- purified (distilled) for use in water containing formulations and for rinsing equipment/utensils
PEC (primary engineering control) aka
the STERILE HOOD that has ISO 5 air for compounding.
SEC (secondary engineering control) aka
The air outside of the PEC (hood) in the room. aka the clean room or the buffer room where the sterile hood (PEC) is located. this has ISO 7 air. This i
CSP (compounded sterile products)
IV drugs
SVP (small volume parenteral)
IV bag </=100 ml
LVP (large volume parenteral)
IV bag or container with > 100 mL
don vs doff of PPE (personal protective equipment)
don - putting on PPE
doff - taking it off
LAFW (laminar air flow workbench)
Type of sterile hood (PEC); parallel air streams flow in one direction
positive air pressure in horizontal flow, no need for external exhaust
CSTD (closed system transfer device)
device that prevents the HD from leaking out
CVE (containment ventilated enclosure)
ventilated powder hood for nonsterile products. can be used for HD if USP 800 is met. usually this is for hormones.
RABS (restricted access barrier system)
glovebox with closed front sterile hood (includes CAI and CACIs)
CAI (compounding aseptic isolator)
glovebox, for non HDs, a closed front sterile hood
can be located in SEC but is often located in a segragated compounding area - a part of the pharmacy that is isolated from other things that could be contaminants. For these, USP just requires the gloves and the rest of the requirements are left to the manufacturer to say how the staff should be garbed. ( no hair cap is necessarily needed always)
no matter what, if it’s compounding for hazardous drugs, you must make sure there is negative pressure
positive pressure in the antechamber
CACI (compounding aseptic containment isolator)
glovebox, for HDs, a type of closed front C PEC
often located in a segragated compounding area - a part of the pharmacy that is isolated from other things that could be contaminants. For these, USP just requires the gloves and negative pressure ( if HD), the rest of the requirements are left to the manufacturer to say how the staff should be garbed. ( no hair cap is necessarily needed always)
no matter what, if it’s compounding for hazardous drugs, you must make sure there is negative pressure
C-SCA (containment segregated compounding area)
Ventilated (negative pressure room used for HDs, not in a clean room suite)
air is not ISO rated (unclassified)
These segregated compounding areas are typically installed when a clean room is not able to be installed. can be used for low risk CSPs (compounded sterile products) and BUD is always 12 hrs
C- SEC
ventilated (negative pressure) buffer room for HDs
BSC (biological safety cabinet)
chemo hood (Class 2 or 3 for sterile HD), a type of CPEC
NIOSH approved fit tested respirator needs to be used if the front cover is opened
CPEC (containment primary engineering control)
Ventilated, negative pressure, chemo hood used for HDs
aka biological safety cabinet
Which organization sets the standard for air quality
International Standards Organization
in critical areas closest to drugs and containers, air must be ISO 5 level (no more than 3,520 parts per cubic meter, Parts that are size 0.5 microns or larger)
ISO also says that the surfaces must be smooth, impervious, easy to clean, and easy to disinfect and they must meet temperature requirements as well.
which air is dirtiest
the further the air is from the PEC.
Hazardous antibiotic
chloramphenicol
hazardous abortion drug
mifepristone, misoprostol
hazardous anticoagulant
warfarin
hazardous antifungal
fluconazole, voriconazole
Hazardous anti-retroviral
abacavir, entecavir, zidovudine
hazardous antitviral
Cidofovir, Ganciclovir, Valgancyclovir
Hazardous acne medication
Isotrentinoin
Hazardous arrhythmia medication
Dronedarone
Hazardous meds for autoimmune conditions
acitretin, azathiopurine, leflunomide, fingolimod, teriflunomide
Hazardous meds for BPH
dutasteride, finasteride
Hazardous bisphosphonates
Pamidronate, Zolendroic acid
Hazardous heart chemoprotectant drug
Dexrazoxane
Hazardous depression drug
Paroxetine
Hazardous diabetes drugs
Exenatide, Liraglutide
Hazardous Dyslipidemia drug
Lomitapide
Hazardous Seizure/epilepsy drug
Clobazam, Clonazepam, carbamezapine, oxcarbazepine, eslicarbezapine, divalproex, fosphenytoin, phenytoin, topiramate, vigabatrin, zonisamide
Hazardous gout drugs
Colchicine
Hazardous heart failure drug
Ivabradine, Spironolactone
Hazardous Hepatitis Drug
Ribavirin
Hazardous hormonal agents
all androgens (testosterone) and estrogens
oxycontin, dinoprostone
Progesterones
SERD/SERMs (fulvestrant, tamoxifen)
Ulipristal
Hazardous hyperthyroidism drugs
Methimazole, propylthiouracil (PTU)
Hazardous insomnia drugs
Temazepam, Triazolam
Hazardous Iron overload drugs
Deferiprone
Hazardous migraine drugs
dihydroergotamine
Hazardous parkinsons disease drugs
apomorphine, rasagiline
Hazardous pulmonary arterial hypertension drugs
ambrisentan, bosentan, macitentan, riociguat
Hazardous Schizophrenia drugs
Ziprasidone
Hazardous Transplant drugs
cyclosporine, mycophenolate, Tacrolimus, Sirolimus
Whenever you see the word “containment” or “C” its referring to
preparing hazardous drugs
What kind of air pressure is in CPEC and CSECs
negative air pressure and the air needs to be externally exhausted for sterile hazardous drugs. for non sterile, they don’t have to be externally exhausted (preferred), but they can be filtered out through redundant HEPA filters instead twice before it goes out.
What is required of the air changes in spaces where hazardous drugs are prepared
need at least 12 ACPH (air changes per hour) for the space where non sterile hazardous drugs are prepared.
and at least 30 ACPH in areas where sterile HD are prepared.
what level air does the anteroom need to be
ISO 7 or 8 is acceptable if it opens into positive pressure area (HD non sterile compounding) since the air is being pushed out into the ante room, it doesn’t matter
but if it opens into negative pressure area (HD sterile compounding), then the anteroom needs to have pressure that matches the CSEC, which is 7, since the air from there is flowing inward.
HEPA filter, what is it and where does airflow come from in LAFW, PEC, and CPEC
high efficiency particulate air filter. picks up particles when air runs through the filter. they are at least 99.97% efficient at removing particles as small as 0.3 microns
in CPEC, the air comes vertically, HEPA is at the top because this is dealing with hazardous drugs and we want to protect the staff
in LAFW and PEC, the air comes horizontally, the HEPA is at the back
What is the DCA (direct compounding area)
This is the area where the air comes directly out of the HEPA filter and its called first air. This is where the air is the cleanest
How often does a HEPA filter need to be recertified
every 6 months and every time a PEC is moved
what type of alcohol must be used to clean the materials before putting them in the hood
70% isopropyl alcohol (IPA)
Remember to open packages along the designated tear line rather than any other way… why
to prevent unnecesary particles from contaminating the air.
True or false: its okay to let waste accumulate inside the PEC while compounding so that you don’t stick your hands in and out too often
false: remove waste as sooon as its created. never let it accumulate in the sterile hood.
How many inches inside the hood do we need to compound
at least 6 in. to prevent exposing the compound to ISO 7 air
what type of air pressure must be used in the CPEC or CSEC for compounding hazardous drugs
negative air pressure. this contains the toxic air in the space and protects the staff member
What type of air pressure must be used in the PEC and SEC for compounding non hazardous drugs
positive pressure is fine
T or F : objects that shed particles like cardboxes are not allowed in the clean room
true
what is the line of demarcation
its in the anteroom/garb room and separates the clean from the dirty areas
shoe covers should be put on one at a time while crossing over the line
what is the BUD of an IV drug compounded for an emergency with no time for aseptic technique
1 hour
yellow containers
trace amounts of hazardous waste (including used syringes, sharps included)
(ex: IV bags, empty syringes, used PPE, including gowns, gloves, masks, and shoe covers)
what is a class 2 biologic safety cabinet
its used for hazardous drugs aka known as a containment hood or a CPEC
what is turbulent airflow vs laminar air flow
laminar - air that flows in parallel lines so that the particles in the air don’t bounce with each other
turbulent airflow is air that has particles that bump all around each other
BUD for anything made in a compounding aseptic isolator (HD or Non-HD)
max is 12 hrs.
black bin
bulk hazardous waste
required testing and training
- didactic training and hands on training
- continuous training for new updates/equipment
- hand hygiene + garbing and gloving technique glove = 3 consecutive fingerprint tests on each hand on [tryptic soy agar (TSA)] and incubated (heated) for 2-3 days. Passing = zero CFU’s on plates for both hands. Repeat annually if compounding low/med risk drugs (most common) or semiannually if high risk drugs
- sterile drug preparation = media fill test. using tryptic soy broth (TSB) in an IV bag or small vial, pretend to aseptically make aseptic drug, and in 14 days, if there is no turbidity, you pass. Repeat at least annually for low/med risk drugs, repeat semi annually for high risk drugs
- cleaning and disinfecting procedures for sterile space and equipment
How often should different temperatures be monitored and documented in the SEC, where should be recorded, and what should temps be
The actual SEC room temp should be monitored once daily. temp should be at or lower than 20 degrees C or 68 F
all fridges and freezers should be documented twice a day
Fridge: 2-8 degrees C; 35-46 degrees F
Freezer : -50 to -15 degrees C; -58 to 5 degrees F
use a temp log
air sampling needs to occur how often
q 6 months by a person certified or qualified
surface sampling is required by USP how often
the book says “periodically”
TSA plate with polysorbate 80 and lectin (they neutralize the effect of disinfectants) is used to test samples AT THE END OF THE DAY when surfaces are in their poorest state. all surfaces regularly exposed to staff are to be tested and at least one sample needs to be from the ISO 5, ISO 7, and ISO 8 area. plates are incubated for 2-3 days
you should see LESS THAN 3 CFUs in ISO 5
less than 5 CFUs in ISO 7
and less than 100 CFUs in ISO 8
if more than the allowed amount is found, identify the organism using PCR and kill it. (ex: staphylocc. from people, pseudomonas from poor air conditioning)
how often should air pressure be checked
each shift (preferrably) or daily at the minimum
some places have a pressure gauge in the room
all non haz prep rooms : positive pressure
all haz prep rooms: negative pressure
how often should humidity be checked and what should it be below
humidity should be checked once daily and be below 60%
t or false: every night, the PEC needs to be shut off.
False, we need to keep the PEC running at ALL TIMES to keep the surfaces clean.
what do we do if a PEC is affected by a power outage
we need to stop all compounding. before re-initiating compounding, we need to clean it with GERMICIDAL DETERGENT (quat, ammonium, phenolics) and then disinfect it with 70% STERILE ISOPROPYL ALCOHOL and then let the hood run for at least 30 minutes before compounding can begin.
there are diff. rules for CPEC
we should always clean from cleanest to dirtiest to avoid making clean spaces dirty
ex: from cleaning PEC to cleaning SEC
use lint free wipes and wipe in unidirectional, slightly overlapping strokes rather than circular motion
true or false: we should clean the PEC with germicidal detergent, and spray 70% isopropyl alcohol inside the PEC and wipe with a lint free wipe in circular motions
false: we should use the same ingredients, but NEVER spray the alcohol in the PEC because it makes airflow turbulent.
always spray on the wipe first or use the already wet wipes. wipe in unidirectional, slightly overlapping strokes rather than circular motion.
clean from top to bottom back to front so the cleanest areas are cleaned first. Always flip the wipe over when cleaning different areas of the hood
PECs are to be cleaned continuously throughout the day
List the steps for how to clean a Laminar airflow PEC
- clean the ceiling of hood, back to front
- clean the grill over the HEPA filter, top to bottom
- clean the side walls from back to front top to bottom
- clean anything kept in the hood (ex: equipment)
- Clean the bottom surface starting from back to front
wait until all surfaces are dry to start compounding
how often should the ceiling, walls, shelving, chairs, bins, and carts be cleaned in the SEC
monthly
how often should ISO 5 PECs be cleaned
before each shift
q30 min while working
before and after each batch of CSPs
whenever needed (ex: after spills)
when should we wipe off the outside container of all supplies
before entering the clean room
what should we use to clean the counters and floors and how often
germicidal cleaner and sterile IPA 70% daily
Sanitization is required for hazardous compounds. What are the steps for sanitization
- Deactivation and decontamination- 2% bleach or peroxide, this helps to reduce HD toxicity. neutralize the bleach to prevent corrosion of surfaces. decontamination is required everytime a spill occurs
- Clean with a germicidal detergent (quat), ammonium, phenolics
- Disinfection - sterile 70% IPA
red bin
for non hazardous sharps
higher risk defined for USP 797 & 795 vs 800
795 and 797 - anything with a higher chance of an unsafe preparation getting to PATIENT
800 - higher chance of causing harm to the WORKERS exposed to the drug
For the lower risk HDs, all pharmacies should either always use ALL of USP 800’s requirements, or the pharmacy should conduct a
risk assessment to decide how they will handle the drugs but they need to make sure to obviously not mix up any equipment for regular drugs with hazardous drugs
first thing to do with drug exposure
rip off clothing (first 10-15 sec after exposure are critical)
- rinse and clean with soap and water; if gets in eye, use an isotonic eye wash for 15 minutes depending on the chemical could be longer.
if there is any risk for suspected exposure to spill or splash we need to wear
face shields and goggles.
if HDs are unpacked and not contained in plastic we should wear
multi gas cartridge and P100 filter until we can verify there is no break.leakage
N95 respirator doesnt provide adequate protection against gases vapors or liquid splashes. it is sufficient for most HDs compounding.
additional resp protection is needed if:
cleaning up spills that require more than whats in the spill kit
deactivating/decontaminating/and cleaning underneath CPEC workspace
when there is known or suspected Hazardous airborne exposure
when disposing of PPO from handling HDs
NEVER USE A SURGICAL MASK FOR HZD
When there is risk of respiratory exposure to HDs, we need to wear
a respiratory mask with attached gas canisters ( “gas mask”)
OR
a powdered air purifying respirator (PAPR)
What is a safety data sheet (SDS) previously called MSDS
safety documents required by OSHA (occupational safety and health administration) to be accessible to all employees who work with Hazardous materials and drugs.
It shares safety info about PPE, first aid, and spill clean up procedures
Contents of a HDs spill clean up kit
protective gown
latex gloves
N96 respirator
googles with side shields
HD waste bag, scoop and scraper, chemo pads
HD spill report exposure form
never use a brush to sweep up anything containing HDs, particles can become airborne
when it doubt, always avoid spraying any cleaners as well. moisten the towel with it too.
never use a brush to sweep up anything containing HDs, particles can become airborne
when it doubt, always avoid spraying any cleaners as well. moisten the towel with the substance .
double glove with heavy duty gloves over ASTM D678 chemo rated gloves
important notes about administering HDs
double glove - with ASTM D678 chemo rated gloves and put on chemo gown when giving IV. if not IV, its not required
use closed system drug transfer devices to avoid spills. recommended when compounding but required when administering chemo drugs
avoid manipulating oral versions of HDs. If required, put it in a bag before crushing so the particles can be contained
all PPE worm after handling HDs, use which bin
yello trace chemo waste bin
all sterile HDs compounding requires
- head cover
- beard cover
- two pairs booties
- two pairs chemo rated gloves
- impermeable gown (seals in back)
- full face respirator or face shield with goggles when there is a risk for spills or splashes
all sterile HDs compounding requires
- one pair booties
- disposable pad to protect work surface
- double gloves
gown
mask
all gloves used with ocmpounding must be sterile and powder free
artificial/long nails, makeup, and all jewelry are not allowed
mirror is required in anteroom so ppl can make sure hair is covered when they put on their hair net.
order of garbing
head and facial hair covers
face mask
shoe covers (step over live of demarcation) (2 pairs if HDs)
hand wash with sap and warm water with a method for hand drying - clean under finger nails under warm water and rub circularly for 30 sec from fingertips to elbows
use lint free towels or hand dryer
- gown (can be reusable only if Non HD and must be washed)
- use alcohol based hand rub in SEC
- put on sterile powder free gloves
sanitize gloves with IPA 70%
- garb should not be warn outside the anteroom. if you leave, you have to dispose them. you can take it off and reuse it. if you leave you need to redo the hygeine
all garb must be used with compounding in an isolator (clovebox
suspension means there is an ingredient that is not dissolving
compounded products have beyond use dates, manufacturers use expiration dates.
master formula tells us instructions for making a specific compound order.
when measuring , use devices that are slightly larger than the one you need to avoid error (ex; syringes and graduated cylinders)
always use equipment dedicated for hazardous drugs for HDs and make sure to always sanitize after use. if the equipment can’t be sanitized don’t use it
avoid using a metal spatula when working with a compound that has metal ions.
oral syringe is more accurate than a measuring cup
all syringes are useful for measuring viscous fluids
we use the metric system for measurement
the wider the mouth on a graduated tool, the less accurate the measurement
ex: graduated cylinder is more accurate than conical
meniscus is that curve that liquid makes in measurement tools and we read the bottom part of it for accuracy
hypodermic injection syringes are aka parenteral syringes
all syringe packages should be wiped off with isopropyl alcohol 70% to remove contaminants and dust before bringing into SEC or PEC
do not recap syringes for safety!!! if its required just slip the needle tip in and avoid touching any part
do not touch the part of the syringe plunger that could cause contamination,
IV push = bolus dose being provided into a vein or into a vein through a catheter
dont use a graduate to measure a volume < 20% of the capacity of that measurement tool
avoid using syringes with a luer lock (male to female part) design for non-oral medications to avoid medication error
mohr pipette is used in compounding. medicine droppers can be used for pts- educate them to keep tip squeezed while administering and until removed to avoid contaminating pipette
Class 3 torsion balance aka class A balance is where we use MWQ (minimum amount that can be weighed) equation
sensitivity requirement of the torsion balances on it is often 6 mg
they are used to weigh things < /=1 gram
top loading electronic balance is more high tech and frequently used, requires zeroing out and glassine weighing paper
a compounding pharmacy needs at least one wedgewood or porcelain mortal and pestle.
glass ones are for liquids/oils, stainable compounds
while wedgewood is best for dry crystals /hard powders and
porcelains are for bblending powders and pulverizing gummy consistency things
ointments are made on compounding slabs
ointment mills, homogeonizers, and grinders are used to mix ingredients. homogenizers are like smoothie blenders, electric grinders are like coffee makers
to avoid burning a substance on a hot plate, can put it in a water bath on the hot plate
ointment mills, homogeonizers, and grinders are used to mix ingredients. homogenizers are like smoothie blenders, electric grinders are like coffee makers
to avoid burning a substance on a hot plate, can put it in a water bath on the hot plate
capsule shells are made of gelatin which is pork derived, so avoid in those with restrictions
if made from hypromellose, thats a plant product
where are high quality ingredients listed
USP national formulary (USP-NF) or food chemicals codex (FCC) substances list
ingredients for compounding should be manufactured at an FDA regulated facility to be considered high quality , and if not, then a certificate of analysis (CoA) is required from wherever the drugs come from
if an ingredient doesn’t have an expiration date, pharmacist can assign a conservative one, no more than 3 years from the date of receipt
always include date or receipt and assigned expiration date on label
surfactants lower surface tension between ingredients to make them more miscible (mixable). they form micelle structures (hydrophobic tail faces lipid part and vice versa) since they are ampiphillic
surfactants can stabilize emulsions so that oil droplets can stay dispersed longer. sometimes they do not form micelles, the form a film between surfaces and still help with stabilzation
types of surfactants
wetting agents (levigating agents)
emulsifers
suspending agents
levigating agents aka wetting agents can be used to reduce surface tension between liquids and solids to allow the substance to be more easily spread
levigation and trituation both are used to grind down particles. levigation uses levigating agents (i.e. mineral oil, glycerin for lipophilic things and polyethylene glycol for hydrophillic things) but trituation is grinding of particles without addition of a liquid.
emulsifiers aka emulgents help keep liquid droplets dispersed throughout a liquid vehicle to prevent them from separating into phases (liquid and water). emulsifiers are types of surfactants
suspension is a solid dispersed but not dissolved in a liquid. suspending agents are used in suspensions to prevent the particles from settling.
always shake suspensions to redisperse solids before use.
suspending agents can be plasticizers (something that makes preparations easier to mold, ex: sorbitol used for gelatin capsules)
examples of suspending agents:
ora plus , must be combined with ora- sweet for flavor (combination is ora-blend). it is slightly acidic to prevent drug degredation through oxidation and its a gel like substance that helps keep particles suspended rather than settling
anti foaming agents are used in compounding (ex: simethicone)
foaming agents lower the surface tension of water
Glycols and gels are used as surfactants and delivery agents. most common are PEG and poloxamer . both of these are ampiphilic, so they can be used to distribute ingredients in their preparation into their like phase.
oral formulations are typical oil/water
topical formulations are typically water/oil (these feel more greasy)
in order to make one or the other we have to use a surfactant with HLB (hydrophilic lipophilic balance) number that is higher than 10 (for more water soluble-ex: tween or PEG 400) or lower than 10 (for more lipid soluble, ex: span 65 and glyceryl monostearate)
HLB scale is 0-20
reactions involving functional groups are common causes of drug degredation and instability (oxidation, hydrolysis, photolysis)
most likely to oxidize = hydroxyl group directly bound to aromatic ring (ex: catecholamines like epinephrine, phenolics like phenylephrine, and aldehydes like flavoring substances)
when water is removed (evaporation) from a compound that means the OH group leaves and forms a carbonyl. and changes color
oxidation = lose electrons
reduction = gain electrons (more negative)
the two happen simultaneously and are called redox reactions
oxidation can look like color change (epinephrine turning orangey yellow)f
we prevent oxidation with :
light protection ex: amber glass or other bags/sleeves
temp control- fridge
chelating agents - metal ions
antioxidants (oxidation produces free radicals and antioxidants like absorbic acid (vitamin c), tocopherols (vit E), help inhibit free radicals)
controling pH with buffer.
compounds subject to hydrolysis must be stored in cool dry places , sometimes desicants kept in bottle. bonds most likely to become hydrolyzed are
carbonyl bonded to OR group (ester)
carbonyl bonded to nitrogen (amide)
lactams/cyclic amides- like beta lactam abx
ways to prevent hydrolysis
storage as a freeze dried lyophylized powder instead of in solution
adsorbents (desicants)
chelating agents
hygroscopic salt (water absorbing salt)
prodrug formulation that require hydrolysis rxn (ex: acetylsalicylic acid is a prodrug that requires hydrolysis to be activated to salicylic acid and acetic acid)
control temp and light and pH
UV light exposure can lead to photolysis breaks covalent bonds and leads to drug degredation
ascorbic acid (vitamin c)
folic acid
nitroprusside and phytonadione (increases vitamin K to enhance blood clotting) injections are sensitive to photolysis
isomerization - compounded changes form into inactive structure
epimerization - changes into the stereoisomer of the compound which could be inactive or active
decarboxylation
- when heated carbondioxide is lost. preventable with refrigeration
do not use preservatives in neonates
ex: chlorhexidine (used in surgical scrubs), povidone iodine, dosium benzonate/benzoic acid/benzalkonium chloride, sorbic acid, potassium sorbate, methyl, ethyl, or propyl parabens
EDTA, thimerosal- contains mercury and is used in some vaccines, cetyl pyridiunium chloride
buffers used to maintain acidic pH
- hydrochloric acid, acetic acid, sodium acetate, citric acid, sodium citrate
buffers used for alkaline pH
boric acid, sodium borate, sodium bicarb , sodium carbonate, sodium hydroxide
distilled water is used for reconstitution, oral suspensions, and non sterile compounding
purified water has removal of chemicals and contaminants
potable water is tap water for cleaning and safe drinking
sterile water for injection (SWFI) is free from bacterial endoxins
alcohol has high miscibility so it can be used with water to dissolves solutes that would be insoluble alone in water
glycols can be use as surfactants and lubricants and emulsifiers and suppository bases
diluents and fillers:
ex: lactose, petrolatum
starch , calcium salts, polacrillin potassium
oils and fats are used as delivery vehicles
emollients are moisturizers
humectants are put into emollients to pull water from the atmosphere to moisturize the skin
ointments 80-100% oil and 0-20% water - best for dry skin
(ex: petrolatum, polybase, aquaphor, aquabase)
creams 50/50 oil and water (ex: lidoderm, water in oil - greasier, or oil in water, cetaphil, eucerin)
lotions have the most water and best for oily skin (small amount of alcohol can be added to solubilize the ingredients)
gels are made of poloxamers which are liquid at fridge temp and gel when at room temp.
poloxamer lecithin organogel (PLO gel)]
‘
gels are pluronic because they are made of two joined polymer compunds (poly-oxy-ethylene and poly oxy propylene)
suppositories are usually made of polybase, hydrogenated vegetable oils, or gelatin, or PEG
ANY TOPICAL COMPOUND MADE WITH WATER INSIDE SHOULD HAVE A BUD OF NO LONGER THAN 30 DAYS
adsorbents
keep powders dry to prevent hydrolysis ex: mg oxide/carbonate, or kaolin
coatings can prevent light degredation
made from gluten, shellac
acacia and PEG are types of emulsifiers (surfactants)
gelling agents (gelatin, cellulose, bentonite)
humectant : glycerin, glycerol, propylene glycol, PEG, hyaluronic acid
wetting agent
mineral oil, glycols, peg, propylene glycol
antifoaming agent
simethicone, dimethicone
avoid alcohol ingredients used as solvents in children
avoid aspartame as sweetener (contains phenylalanine) in phenylketonuria (PKY) cause they cant’ metabolize it
avoid gelatin in those who prefer no pork, hypermellose or cellulose are vegan alt.
acoid
avoid gluten in celiac pts, use starch instead
avoid lactulose as a sweetener in pts who have lactose allergy,
avoid preservatives in neonates ex; benzyl alcohol . should always use preservative free.
avoid sorbitol in IBS cause it can cause distress
avoid sucrose in DM or be cautious of amount
avoid xylitol sweetener in dogs (causes liver damager and hypoglycemia) and Gi upset in humans
