Drugs in Red - Exam 3 Flashcards
Muscarine
- Cholinergic drug that mimics ACh actions on ACh muscarinic receptors
- Elicits parasympathetic response generally speaking
Atropine
- Anticholinergic drug
- Prototype Muscarinic Receptor Antagonist (Blocker)
- Tertiary amine
- One of the active compounds of Belladonna (d,l-hyoscyamine)
- Increases heart rate, may cause tachycardia
- Used in organophosphate poisoning to clear chest secretions and increase heart rate
- Clinical doses have little CNS actions
Varenicline Tartrate
- Chantix
- Partial CNS nicotinic receptor agonist
- Stimulates Alpha4/Beta2 nicotinic AChR
- Relieves cravings and withdrawal symptoms
- Greater affinity than nicotine, so acts as an antagonist towards nicotine delivery and reduces the reward of smoking
- SE: Nausea, sleep disturbances
- FDA Warning: can worse neuropsychiatric symptoms like depression, agitation, and suicidal thoughts
- Pregnancy Category C
Nicotinic Muscle Receptor Antagonists (4)
- Tubocurarine
- Pancuronium
- Atracurium
- Vecuronium
Nicotinic Ganglionic Receptor Antagonist
Mecamylamine
Nicotinic CNS Receptor Agonist
Chantix (Varenicline)
Donepexil
- Inhibitor of AChE
- Used to treat Alzheimer’s
- Increases ACh in brain
Muscarinic Receptor Antagonists (Not Subtype Specific)
- Atropine
- Ipratropium
- Tiotropium
- Dicycloverine
- Oxybutynin
Propranolol/Esmolol
- Beta 1 Antagonists
- Slows heart rate
- May cause bradycardia
Sildenafil, Tadalafil, Vardenafil
- Viagra, Cialis, and Levitra
- PDE5 Inhibitors
- Inhibits breakdown of cGMP
- Prolongs cGMP’s effect: vasodilation
- Longer erections
Acetylcholine (Ophthalmic)
- Miochol-E
- Used in glaucoma or cataract surgery
- Miosis of iris which increases outflow of aqueous humor
- Quickly broken down by AChE, systemic responses rare
- Rare side effects: bradycardia, hypotension, flushing, breathing difficulties and sweating
Pilocarpine (Ophthalmic)
- Isopto Carpine
- Reduces IOP by facilitating humor outflow
- Contracts ciliary muscle and iris sphincter (miosis) which opens trabechular meshwork and angle narrowing
- Less resistance to outflow, less IOP
- Can cause headache, issues with vision, eye pain
Isopto Carpine Therapeutic Uses (3)
1) Reduces elevated intraocular pressure (IOP) in patients with open-angle glaucoma or ocular hypertension.
2) Prevention of Postoperative Elevated IOP associated
with laser surgery.
3) Induction of Miosis
Carbachol
- Miostat
- Contracts iris sphincter and ciliary body
- Relieves increased IOP for first 24 hours after cataract surgery
- Systemic SE: flushing, sweating, epigastric distress, abdominal cramps, tightness in urinary bladder.
- Use caution with patients with acute cardiac failure, bronchial asthma, GI spasm, or urinary bladder obstruction
Timolol
- Betimol, Timoptic
- Beta Adrenergic Antagonist, alternate glaucoma therapy
- Decreases aqueous humor production by ciliary bodies
- Beta 1 and 2 antagonists (non-selective)
- Reduces IOP in glaucoma and normal patients
- SE: worsening asthma, emphysema, bradycardia
Betaxolol
- Betoptic
- Beta-adrenergic antagonist, alternative therapy for glaucoma
- Beta-1 antagonist (selective)
- Decreases aqueous humor production by ciliary bodies
- Less cardiac/pulmonary effects than Timolol
Pilocarpine (Oral)
- Salagen
- Tablets for dry mouth from salivary gland hypofunction
- Radiotherapy or Sjogren’s syndrome can cause this
- Main side effect: sweating
- Use caution with patients with CV disease or COPY, asthma, or bronchitis
- Prolonged muscarinic activation in those with pseudocholinesterase genetic alterations
Cevimeline
- Evoxac
- Capsule, TID
- Treats dry mouth for Sjogren’s Syndrome
- Chol. muscarinic receptor agonist that increases exocrine gland secretions (saliva, sweat) and increases tone to GI/urinary tract
- Main side effect: excessive sweating
- Use caution in those with CV disease or pulmonary disease
- Use atropine or epinephrine to reverse its effects in emergency situations (overdose, extreme cardiac/respiratory depression)
Mirabegron
- Myrbetriq
- Beta 3 agonist
- Relaxes bladder
Bethanechol
- Duvoid, Urecholine
- Muscarinic agonist
- Increases urinary muscle tone to produce contraction and empty bladder
- Increases GI muscle tone to restore impair peristalsis
- Used in non-obstructive urinary retention, neurogenic atony of nerves to bladder
- Main side effects: cholinergic digestive effects
Bethanechol Precaution
If sphincter doesn’t relax when the drug contracts the bladder, urine may be forced up ureter into the renal pelvis and could cause reflux infections.
Succinylcholine
- Depolarizing NM Blocker
- Skeletal muscle relaxant
- Phase I: depolarizes skeletal muscle and produces fasciculations (SE: Sore muscles)
- Phase II: constant stimulation of receptor inactivates it and causes flaccid paralysis
- AChE inhibitors may augment the effect
- Sleep apnea reaching up to 60-120 minutes in those with pseudocholinesterase genetic variations
- Action is terminated when it diffuses form synapse to blood stream
Cocaine
- Local anesthetics
- Usually 30-50% of injected cocaine is metabolized by pseudo. ChE rapidly
- If a genetic variation or hepatic disease is present and these enzyme levels are lowered, users will have increases sensitivity to small doses and could have a greater risk of toxicity and death
Edrophonium
- Enlon
- AntiChE, short acting
- Quat. ammonium compound
- Binds to anionic site only, no covalent bond
- Reversible and brief action
- Used to diagnose myasthenia gravis, treat a myasthenia gravis crisis in an emergency, or reverse a NM blockage produced by non-depolarizing blockers
- Side effects similar to direct Ch agonists
Neostigmine
- Prostigmine
- AntiChE, intermediate duration
- Quat. ammonium
- Contains carbamyl ester
- Increases gastric contractions and secretions, increases sphincter tone and peristalsis in esophagus, increases motility in intestines in those with ileus
- Direct effect on skeletal muscle and produces contraction
- Could potentially be used to reverse competitive neuromuscular blocking agents and in treating myasthenia gravis
Pyridostigmine
- Mestinon, Regonol
- AntiChE, intermediate duration
- Quat. ammonium
- Contains carbamyl ester
- May have direct effect on NMJ
- Could potentially be used to reverse competitive neuromuscular blocking agents and in treating myasthenia gravis
- FDA approved for prophylaxis against soman, an organophosphate
- Clinical effect: 10-15 minutes
Echothiophate
- Phospholine
- Irreversible AntiChE
- Contains a liable leaving group like fluoride or parathion
- No spontaneous hydrolysis can occur and enzyme is inactivated
- Used to treat glaucoma by contracting ciliary muscle and pupil sphincter (miosis)
- Reserved for those not responding or tolerating other therapy due to systemic effects
Benzodiazepines
- Used IV in organophosphate poisoning
- Treats agitation and seizures
Oximes
- 2-PAM
- Infused
- Need to use early to reverse organophosphate binding before aging can take place
Edrophonium Drug Interactions
- Other AChE compounds - potentiation of effects can cause a cholinergic crisis.
- NMJ blocker Succinylcholine- may prolong block.
- Digitalis, Pilocarpine - additive, slows heart
Edrophonium Contraindication
- Asmathetics
- Urinary or intestinal obstructions
Neostigmine Side Effects
- Exaggerated pharmacological effects like fasciulation and salivation
- Bowel cramps and diarrhea may also occur
Neostigmine Methylsulfate
- IM or SC
- Myasthenia gravis symptom control when oral isn’t an option
- Prevents urinary retention and distention after surgery
- Reverses non-depolarizing NM blocking agents after surgery
Pyridostigmine Side Effects
- Standard doses - fasciculations
- High doses - muscle weakness
- Abdominal cramps and diarrhea
- Used IV in hospital emergencies, may cause bronchial secretions and arrhythmias
Physostigmine
- Eserine
- AntiChE, intermediate duration
- Contains a carbamyl ester
- Used to treat anticholinergic drug toxicity, reverse muscarinic blockades, in glaucoma
- Crosses BBB, may cause seizures
- Increased duration in those when pseudo. ChE variations or hepatic disease
- Similar side effects to edrophonium, increases duration and potency can make them more severe though
- Don’t use in those with asthma, CV disease, or urinary/intestinal block
Corticosteroids + Myasthenia Gravis
- Prednisone
- Clinical effect time: 2-8 weeks
- Decreases AChR antibody levels
- Alternate dosing days
- Side effects: weight gain, decreased bone density, GI irritation
Oral Immunosuppressant Medications + Myasthenia Gravis
- Cyclosporine - clinical effect time of 2-6 months
- Azathioprine - clinical effect time of 3-18 months
- Inhibit T and B lymphocytes and IL-2
Donepezil
- Aricept
- Cholinesterase inhibitor approved to treat mild to moderate Alzheimers
- Drug do not reverse Alzheimers, just slow the progression
- Side effects: cholinergic (N/V, diarrhea, bradycardia)
Rivastigmine
- Exelon
- Cholinesterase inhibitor approved to treat mild-moderate Alzheimers
- Available as a patch, may have less N/V and more CNS selectivity
- Drug do not reverse Alzheimers, just slow the progression
- Side effects: cholinergic (N/V, diarrhea, bradycardia)
Memantine
- Namenda
- NMDA Receptor antagonist
- Prevent/slow rate of memory loss in Vascular-dementia and Alzheimers (even in moderate to severe patients)
- Few drug-drug interactions and adverse events
- Side effects: confusion, agitation, restlessness
- High doses produce ketamine or PCP-like effects (hallucinations, stupor)
Scopolamine
- Hyoscine
- Active compound in Belladonna with anticholinergic properties
- Clinical doses cause CNS depression with drowsiness, amnesia, and fatigue
- Patch
- Used for motion sickness and to recover from anesthesia and surgery
- Side effects: Dry mouth and drowsiness
- May worse open-angle glaucoma from mydriatic effect
Antimuscarinic Agents (5)
- Atropine
- Ipratropium
- Scopolamine
- Cyclopentolate
- Tropicamide
Long-Acting Antimuscarinic Agents (2)
- Tiotropium
- Aclindium
Atropine Dose-Based Side Effects
- Low doses: depress salivary/bronchial secretions & sweating.
- Moderate doses: pupil dilates, accommodation of the lens to near vision is inhibited, and heart rate is increased.
- Larger doses: antagonize ACH control of the urinary bladder and gastrointestinal tract, thereby inhibiting micturition and reducing the tone and motility of the gut (constipation)
- Highest dose: greater inhibition - gastric motility/secretion.
Benztropine
- Cogentin
- Helps correct imbalance of dopamine and ACh in CNS
- Used to treat Parkinsons and post-antipsychotic treatment
- SE: confusion, memory problems, anticholinergic in PNS
Trihexyphenidyl
- Artane
- Helps correct imbalance of dopamine and ACh in CNS
- Used to treat Parkinsons and post-antipsychotic treatment
- SE: confusion, memory problems, anticholinergic in PNS
Tropicamide
- Mydriacyl
- Dilates pupil, paralyzes ciliary muscle, abolishes normal pupil reflex to light
- Used to examine retina and optic disc, used to reduce painful ciliary muscle spasm
- Side effects: photophobia, transient stinging and rise in IOP, acute attacks of angle-closure glaucoma in rare cases
Atropen
-Abboject, Atropine auto-injector
-Abolishes vagal reflex to slow heart or asystole from pressure on eyeball, peritoneal stimulation, or injection of contrast dye in cardiac catheterization
-Mainly used in ICU and in short-term interventions
-Also can increase heart rate or decrease AV-block from excess vagal tone
SE: counteracts systemic ACh agonists’ effects like BP drops and vasodilation, no effect when given alone from lack of cholinergic innervation in blood vessels
Ipratropium
- Atrovent
- Short acting anticholinergic
- Inhalation
- Used to treat asthma and COPD
- Relieves rhinorrhea from cold and allergic rhinitis
- DOESN’T relieve nasal congestion or sneezing
- Causes bronchodilation
- Minimally absorbed systemically due to quat. ammonium
- Not selective between muscarinic receptors, dissociates a little more slowely from M3 than M2 making its duration ~3-4 hours
Tiotropium
- Spiriva
- Long acting anticholinergic and bronchodilator
- Inhalation
- Used to treat moderate to very severe COPD
- Quat. ammonium with low systemic absorption and no CNS effects
- Dissociates MUCH slower from M3 receptor making it more selective and prolonged in activity, duration ~24 hours or more
Belladonna & Opium
- Suppositories
- Include morphine, atropine, and scopolamine
- Used to treat severe pain from uretal spasms or rectal/bladder tenesmus in post-op or neoplastic states
Donnatal Extentabs
- FDA: “possibly effective”
- Contains antimuscarinics
- Adjunctive therapy in IBS and duodenal ulcers
- Could cause urinary retention, tachycardia, mydriasis, xerostomia, and constipation
Dicyclomine
- Bentyl
- Treats functional bowel disorder and IBS
- Relieves smooth muscle spasms by having an antimuscarinic effect and directly acting on smooth muscle by antagonizing bradykinin and histamine caused spasms
- Side effects: anticholinergic
Oxybutynin
- Ditropan
- Treats overactive bladder
- Muscarinic antagonist
- Decrease the normal tone and amplitudes of contractions in the ureter and bladder
- Available in many forms, gel, syrup, tablets, patch
- Patch may produce fewer anticholinergic effects
Tolterodine
- Detrol
- Treats overactive bladder
- Muscarinic antagonist
- Decrease the normal tone and amplitudes of contractions in the ureter and bladder
- Tablets
Overactive Bladder Drug Precautions
- Caution when treating patients with urinary or gastric retention
- Caution in patient with decreased GI motility
Hydrocodone
- Analgesic
- Relief of cough, nasal congestion, and moderate pain
- High abuse potential
-Hycodan
- Hydrocodone + Homatropine
- Tablet or liquid form
- Homatropine is an anticholinergic that discourages abuse of the product
Diphenoxylate
- Lomotil
- Schedule V
- Prescribed orally to treat diarrhea
- Diphenoxylate + Atropine to discourage abuse
Albuterol
- B2 selective agonist
- Dilates bronchi
- Used to treat mild to very severe COPD
- If absorbed, little effect on B1 cardiac receptors since it is selective
- Short acting
- Inhalation
Combivent/Duoneb
- Combinations of Albuterol and Ipratropium
- Caution using with other anticholinergic drugs and in those with CV disorders
- Inhalation
Salmeterol
- Severent Diskus
- B2 selective agonists
- Long-acting bronchodilator
- Used to treat moderate to very severe COPD
- Inhalation
Combination LABA/LAAC
- Vilanterol/Umeclindium (Anoro Ellipta)
- Olodaterol/Tiotropium (Stiolto Respimat)
- Inhalation
- Once daily
- Used to treat moderate to very severe COPD
Fluticasone
- Flovent
- Inhaled anti-inflammatory drug
- Used to treat severe to very severe COPD
- Mometasone and Fluticasone have <1% systemic absorption (act locally in lung)
Fluticasone + Salmeterol
- Advair HFA
- Inhaled anti-inflammatory + B2 agonist
- Used to treat severe to very severe COPD
Theophylline
- Theolair, Slo-phyllin
- Adenosine receptor antagonist
- Adenosine constricts the bronchi
- Used in severe to very severe COPD patients who need additional symptom control
CYP3A4 Inhibitors
- Ketconazole
- Itraconazole
- Ritonavir
- Increase the systemic toxicity of inhaled corticosteroids when co-administered
CYP3A4 Inducers
- Phenytoin
- Carbamazepine
- Phenobarbital
- Rifampin
- No change in toxicity when co-administered with inhaled corticosteroids (since systemic absorption is already so small)
Roflumilast
- Daliresp
- Selective PDE4 inhibitor, cAMP metabolizing enzyme in the lung
- Reduces risk of COPD exacerbations in severe COPD
- Not a bronchodilator or indicated for relief of bronchospasms
- Main side effects: diarrhea, weight loss, nausea, psychiatric adverse reactions
Nicotine
- Acts on both sympathetic and parasympathetic ganglia
- Increases blood pressure from sympathetic activation (releases epi. from adrenal glands and norepi. on blood vessels not innervated by parasymp.)
- Increases GI/urinary tract peristalsis and secretions from parasympathetic activation
- Activates activity that predominates the associated organ system
- Tertiary amine with no therapeutic benefits
- Highly lipid soluble and can enter CNS
- Releases dopamine and opiate peptides onto nucleus accumbens to create dependence and cravings
- Withdrawal occurs within 24 hours after quitting
Mecamylamine
- Inversine
- Reduces blood pressure in normal and hypertensive patients
- Noncompetitive antagonist of nicotinic AChR in ganglia
- Uses in those with essential hypertension and malignant hypertension
- D/C slowly since sudden stopping could cause strokes or heart failures
Mecamylamine Side Effects
- GI: Ileus, constipation, dry mouth
- CV: hypotension, dizziness, mild tachycardia
- NS/Psychiatric: convulsions, tremors, sedation
- Urogenital: urinary retention
Tubocurarine
- Non-depolarizing NM Blocker prototype
- Replaced with other drugs due to SE including histamine release and hypotension
Cisatracurium
- Nimbex
- Degrades in plasma spontaneously
- Non-depolarizing NM Blocker
- Good to use in those with renal failure
Pancuronium
- Pavulon
- Non-depolarizing NM Blocker
- Increases heart rate
- Don’t use in kidney disease patients
Rocuronium
- Zemuron
- Non-depolarizing NM Blocker
- Rapid onset
- Used for tracheal intubation
- Don’t use in liver disease patients
Vecuronium
- Norcuron
- Non-depolarizing NM Blocker
- Used for mechanical ventilation in ICU
- Also reduces oxygen consumption, protects surgical wounds/medical device placement, helps control elevated intracranial pressures, prevents muscle spasms
- Don’t use in patients with liver disease
Suggammadex
- Bridion
- Reversal of rocuronium and vecuronium induced NM blockade
- Renally excreted unchanged, don’t use in renally impaired patients
- Adverse effects: N/V, hypotension, pain, and headache
- Forms a complex with NM blocker to reduce the amount available to block NM receptors
Succinylcholine Uses
- Facilitate tracheal intubation
- Adjunct to general anesthesia
- Skeletal muscle relaxation during surgery or mechanical ventilation
- Electroconvulsaive Shock Therapy (ECT)
Succinylcholine Black Box
Those with undiagnosed skeletal muscle myopathy (usually Duchenne’s muscular dystrophy) who are administered succinylcholine may experience acute rhabdomyolysis with hyperkalemia. This will progress to cardiac arrest and death.
Cotinine
- Best biomarker for nicotine use
- Half life is about 16-20 hours
- Can be measured in urine, serum, saliva, and hair
Transdermal Nicotine Patches
- Slowest delivery to CNS
- 6-8 hours to reach peak
- Start before quitting smoking
- Can cause pruritus, insomnia, and vivid dreams
- Remove before bed to avoid sleeping disturbances
- Try different brands if pruritus arises
- Pregnancy Category D
Nicotine Oral Replacement
- Absorbed through oral mucosa
- Gum, lozenges, oral inhalers
- Peak reached in 20-60 minutes
- Highly susceptible to first pass metabolism if swallowed
- Causes nausea and indigestion if swallowed
- Pregnancy Category D
Nicotine Nasal Spray
- Fastest onset: 5-20 minutes
- Doubled cessation rates when used with patch
- May cause transient burning and stinging, throat irritation, rhinorrhea, and nausea
- Pregnancy Category D
Bupropion SR
- Catecholamine reuptake inhibitor
- Used to treat depression
Bupropion
- Zyban
- FDA approved to treat tobacco dependence
- Increases cessation rates to 36% when used with patch
- Adverse events: insomnia and dry mouth
- Don’t take if there is a history of seizure, stroke, or brain tumors/injuries
- Pregnancy Category C
Clonidine
- Catapres
- Not FDA approved for smoking cessation
- Used in those who cannot tolerate other nicotine replacement therapies or drugs
- Inhibits symp. NS activation by CNS
- Mixed results on whether it is effective in smoking cessation
Nortriptyline
- Pamelor
- TCA
- Improves cessation rates to 23% when used with patch
Rimonabant
- Acomplia
- Antagonist of cannabinoid type 1 receptors
- Decreases nicotine self-administration