Pharm test 2 Flashcards
Sulfonylureas end in….
-ide; GlipizIDE, GlyburIDE, GlimepirIDE
What class of hypoglycemics are sulfonylureas?
Insulin secretagogues
What is the MOA of sulfonylureas
promote insulin release from beta cells of pancreas; also reduce hepatic glucose clearance and increase peripheral insulin sensitivity by prolonging half-life
What do sulfonylureas do in B cells?
close potassium channels leading to depolarization of cell, opening of Ca2+ ion channels and release of insulin
Where are sulfonylureas metabolized?
liver
What are the adverse effects of sulfonylureas?
HYPOglycemia, hyperinsulinemia, weight gain
Which sulfonylurea options are safer for patients with renal dysfunction and the elderly?
Glipizide and glimepiride
WHich medications interact with sulfonylureas and can lead to hyperglycemia?
glucocorticoids, diuretics, antipsychotics
Which medications interact with sulfonylureas and can lead to hypoglycemia?
B-blockers, sulfonamides, antifungals
Glipizide duration of action and dosing per day
14-16 hours and either once or twice a day
Glipizide XL duration of action and dosing per day
24 hours; once daily
Glimepiride duration of action and dosing per day
24+ hours; once daily or 4mg BID instead of 8mg once a day
MOA of meglitinides
prevent ATP-sensitive potassium channels from opening; controls postprandial glucose levels
Examples of meglitinides
prandin (repaglinide)
starlix (nateglinide)
Dosing of meglitinides
TID before meals
AEs of meglitinides
hypoglycemia, weight gain
Should meglitinides be taken if a meal is skipped?
NO! controls postprandial glucose levels; could lead to hypoglycemia
MOA of biguanides
decreased hepatic gluconeogenesis (decreased glucose production in the liver); increased glucose uptake by muscles; decreased glucose absorption via GI tract
A1C reduction by biguanides
approx. 1.5
AEs of biguanides
N/V, diarrhea, loss of appetite, weight loss, lactic acidosis
How do we avoid AEs of biguanides?
slow-titration and take with meals
Which patients should avoid taking biguanides?
Those at risk for lactic acidosis:
impaired renal function
topiramate use
>65 years old
future radiology studies with contrast
excessive alcohol intake
How long does a patient need to be off biguanides prior to an imaging test with contrast dye?
one week!
Which labs need to be checked with biguanide use?
eGFR and SCr
Renal-dependent dosing for biguanides
eGFR <30mL/min- advanced CKD; contraindicated
eGFR 30-45mL/min- generally not recommended, 500mg QD to BID at most
eGFR 45-60mL/min- max 1.5g/day in BID dosing; renal monitoring every 6 months
eGFR >60mL/min- normal dose up to 2g/day in BID dosing
MOA of thiazolidinediones (TZD)
activates PPAR-gamma leading to increased insulin sensitivity in the adipose tissue, muscle, and liver; also decreases hepatic glucose production
Examples of thiazolidinediones (TZD)
pioglitazone (Actos)
rosiglitazone (Avandia)
What patients should not the use TZDs?
those with symptomatic CHF, NYHA class III or IV heart failure
those with osteoporosis (decreased bone density with use)
AEs of thiazolidinediones
fluid retention/CHF
weight gain-edema
increased risk of bladder cancer (pioglitazone)
macular edema
decreased bone density and increased risk of fractures
Renal dosing for thiazolidinediones
No renal dosing! ok for use in patient with renal problems
MOA of SGLT-2 inhibitors
inhibit the reabsorption of glucose in tubular lumen of kidney
A1C reduction with SGLT2 inhibitors
0.4-1.1
Contraindications in using SGLT-2 inhibitors
DMI, DMII with low GFR (no use in renal failure!), bladder cancer
Avoid SGLT-2 inhibitor use if possible in patients with….
frequent UTIs or yeast infections, low bone density, foot ulcers, factors predisposing them to DKA (alcohol use)
When to consider the use of SGLT-2 inhibitors…
patients with inadequate glycemic control on two oral agents OR if metformin and insulin are not a therapeutic option
AEs of SGLT-2 inhibitors
volvovaginal candidias, UTIs, urinary frequency, hypotension (particularly in elderly or patients on diuretics), ketacidosis
Steglatro (Ertugliflozin) dosing/ renal dosing
once daily in the morning, contraindicated in GFR < 60
Canagliflozin (Invokana) dosing/renal dosing
Daily before first meal, contraindicated in GFR <45; no more than 100mg with GFR 45-59
Empagliflozin (Jardiance) dosing/renal dosing
Once daily in the morning, contraindicated in GFR <45
Which SGLT-2 inhibitor reduces the risk of cardiovascular death in patients with T2DM and CVD?
Empagliflozin (Jardiance)
Dapagliflozin (Farxiga) dosing/renal dosing
Daily AT ANY TIME, contraindicated in GFR <30 and active bladder cancer
Incretin
gut-driven peptide that are secreted after nutrient intake
GLP-1
glucagon-like peptide-1; responsible for 60-70% of postprandial insulin secretion
What degrades GLP-1?
DPP-4
MOA of GLP-1 agonists
incretin mimetics; enhances postprandial insulin secretion, reduces food intake by enhancing satiety, decreases postprandial glucagon secretion, promotes B-cell proliferation (stimulating more insulin production)
A1C reduction on GLP-1 agonists
0.55-1.38
Examples of GLP-1 agonists
Long acting: albiglutide (tanzeum), dulaglutide (trulicity), semaglutide (ozempic) liraglutide (victoza),
Short acting: lixisenatide (Adlyxin), exenatide (byetta, bydureon)
Which GLP-1 agonist has an oral form?
semaglutide (rybelsus)
AEs of GLP-1 agonists
N/V/D/C, weight loss, pancreatitis, increased satiety, possible thyroid tumors so contraindicated in pts with hx of thyroid or other endocrine cancers, hypoglycemia
Which GLP-1 agonist should be not be used in renal impairment?
Exenatide (Byetta, Bydureon)
Which GLP-1 agonist is approved to reduce the risk of cardiovascular events and cardiovascular mortality?
Liraglutide (Victoza)
Instructions for a missed dose of dulaglutide
If at least 72 hours before next scheduled dose- administer ASAP
If less than 72 hours before the next scheduled dose- missed dose is skipped and next dose is administered on regularly scheduled day
Then resume regular once a week dosing schedule
The day of weekly administration can be changed as long as the last dose was 3 days before.
MOA of DPP-4 inhibitors
inhibits DPP-4 from breaking down GLP-1 allowing for GLP-1 to exert its effects longer leading to decreased glucose levels; increases release of insulin postprandial and decreases secretion of postprandial glucagon
Which medications can be used in combination with DPP-4 inhibitors?
sulfonylureas, metformin, TZDs, insulin
NO COMBO use with GLP-1 agonists
All DPP-4 inhibitors require renal dosing EXCEPT…
linagliption
Changes in weight with DPP-4 inhibitors
none, they are weight neutral. Also do not cause satiety
Dosing of DPP-4 inhibitors
Taken once daily, well-absorbed with oral administration, ok to take with meals
AEs of DPP-4 inhibitors
usually well tolerated, nasopharyngitis, headache, pancreatitis, risk of severe joint pain, increased risk of heart failure with alogliptin and saxagliptin
Which DPP-4 inhibitors increase the risk of heart failure?
Alogliptin (Nesina) and saxagliptin (Onglyza)
Examples of DPP-4 inhibitors
Alogliptin (Nesina), Saxagliptin (Onglyza), Sitagliptin (Januvia), Linagliptin (Tradjenta)
DPP-4 inhibitors end in
-gliptin
Insulin analogues
made by recombinant DNA technology, administered SubQ, IV, or inhalation
Concentration of insulins
all have concentration of 100 units/mL except glargine (Toujeo) which is 300 units/mL
Regular insulin onset, peak, duration
Onset: 1/2-1 hour
Peak: 2-4 hours
Duration: 6-8 hours
Lyspro/Aspart/Glulisine onset, peak, duration
Onset: <15 minutes
Peak: 1-2 hours
Duration: 4-6 hours
NPH onset, peak, duration
Onset: 1-2 hours
Peak: 6-10 hours
Duration: 12+ hours