Diabetes and Endocrine Flashcards
Levothyroxine MOA
synthetic T4 and some of the T4 is converted to T3
Levothyroxine Use
any type of hypothyroidism
thyroidectomy
myxedema coma
Levothyroxine A/E
thyrotoxicosis: (hyperthyroidism) increased HR, A fib, angina, chest pain, tremors, wt. loss, diarrhea
Levothyroxine patient education
take on an empty stomach about 30-60 minutes before a meal, avoid changing brands
levothyroxine monitoring
Q3mo until maintenance dose is reached, then annually
liothyronine
synthetic T3, works faster and is used for myxedema coma when a faster action is needed
Propylthiouracil (PTU) MOA
inhibits thyroid hormone synthesis and also decreases conversion of T4 to T3
PTU use
hyperthyroidism
thyrotoxicosis
preferred drug for pregnancy
PTU A/E
agranulocytosis
PTU dosing
2-3 times a day, could be concern for nonadherence
PTU and pregnancy
crosses the placenta more poorly than other drug
Methimazole MOA
prevents oxidation of iodine and incorporation of iodine into tyrosine
inhibits peroxidase, the enzyme that catalyzes the oxidation process
Methimazole Use
overall the safer antithyroid drug
graves disease
thyroid cancer, per surgery for thyroidectomy
Methimazole contraindications
PREGNANCY
Methimazole A/E
Agranulocytosis
Sulfonylureas 1st gen drugs
Chlorpropamide
Sulfonylureas 2nd gen drugs
Glimepiride
Glipizide
Glyburide
Sulfonylureas MOA
stimulates the pancreas to release insulin, increases sensitivity to insulin at the receptor sites (muscle cells),
decrease hepatic glucose production
Sulfonylureas Uses
T2DM only, not the first line drug– 2nd line drug
Sulfonylureas contraindications
pregnancy– not approved but still given
Sulfonylureas A/E
hypoglycemia cardiotoxicity/ cardiac effects hepatotoxicity/ liver effects wt. gain GI disturbances are #1--lasting about 3 wk (diarrhea, nausea, flatas)
Sulfonylureas Drug interactions
Disulfiram like reaction with alcohol
Beta blockers – mask effects of hypoglycemia
antifungals, corticosteroids, thiazide diuretics, antidepressants all increase BG
Biguanide drug
Metformin
Metformin MOA
increase sensitivity to insulin decrease hepatic production of glucose decrease intestinal absorption of glucose decreases need for insulin decreases postprandial BG
Metformin Use
T2DM
1st line treatment
prediabetes
pregnancy
Metformin A/E
diarrhea decreased appetite nausea -- GI effects will go away after a tolerance is built up wt loss *lactic acidosis -- must stop drug
Metformin drug interactions
alcohol
cimetidine
Metformin contraindications
renal disease
GFR <45
receiving contrast dye
acutely ill
Metformin patient educations
does not cause hypoglycemia
Metformin nursing implementations
delay T2Dm, more effective in <60 y/o and underweight, stop 1-2 days before and after procedure where contrast dye is used
Thiazolidinediones (TZD) drugs
Pioglitazone
Rosiglitazone
TZD MOA
decreases insulin resistance by increasing insulin action at receptors and post receptor level in hepatic and peripheral tissues
TZD A/E
fluid retention: wt gain, congestive HF
hepatotoxicity
hypoglycemia
TZD drug interactions
decrease effects of birth controls
often used in combo with other drugs
can be used as monotherapy
TZD monitoring
wt gain, SOB, chest pain, fluid retention
can be used in mild CHF only
check LFTs
Alpha-glucosidase enzyme inhibitor drugs
Miglitol
Acarbose