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
A-glucosidase enzyme inhibitor MOA
delays breakdown of CHO in the small intestine
** does not stimulate insulin secretion
A-glucosidase enzyme inhibitor A/E
wt. gain
GI effects
A-glucosidase enzyme inhibitor Patient education
dont eat, dont take
blocks breakdown of sucrose
if hypoglycemic give glucose tabs because candy will not work
Meglitinide drug
Repaglinide
Repaglinide MOA
stimulates insulin secretion by inhibition of ATP sensitive K channels in beta cells
Repaglinide A/E
hypoglycemia GI effects HA chest pain UTI
Repaglinide drug interactions
usually given with metformin
Repaglinide Patient education
take before a meal, dont take if dont eat
DPP4 inhibitor drug
Sitagliptin
Sitagliptin MOA
Blocks enzyme, increasing the release of insulin
inactivates incretin hormones GIP-1 and GLP
inhibits the inhibitor increasing insulin
Sitagliptin Use
3rd line choice drug
only to be used in patients who produce insulin
Sitagliptin A/E
hypoglycemia HA pharyngitis arthritis pancreatitis angioedema anaphylaxis SJS
Sitagliptin dosing
decrease dose in renal impairment
Sitagliptin Patient education
can be taken with or without food
SGLT-2 drugs
Canagliflozin
Dapagliflozin
SGLT-2 MOA
blocks reabsorption of glucose in the renal tubules
SGLT -2 A/E
UTI
fungal infections in women
postural hypotension
SGLT-2 contraindiaction
GFR<45
Incretin mimetics drug
Exenatide
Exenatide MOA
causes release of endogenous incretin hormones (GIP-1)
slows gastric emptying
stimulates release of glucose dependant insulin
inhibits postprandial glucose release
Exenatide Use
T2DM only
injectable
Exenatide A/E
hypoglycemia with sulfonylureas injection site reaction **pancreatitis renal impairment fetal harm angioedema anaphylaxis **thyroid C-cell tumor (cancer)
Exenatide drug interactions
decreases absorption of other PO drugs
hypoglycemia with alcohol
Exenatide nursing implementations
give PO drugs before this medication
regular insulin
short acting
regular insulin onset
30-60 min
regular insulin peak
1-5hr
regular insulin duration
6-10 hr
lispro, aspart
rapid acting insulin
lispro onset
15-30 min
lispro peak
0.5-2.5 hr
lispro duration
3-6hr
Aspart onset
10-20 min
Aspart peak
1-3 hr
Aspart duration
3-5 hr
Lispro, Aspart, regular insulins mix
with NPH only
Lispro good for
those who dont eat regularly
NPH
intermediate acting insulin
NPH onset
1-2 hr
NPH peak
6-14hr
NPH duration
16-24 hr
NPH dosing
BID morning and evening
70/30 mix
70% NPH, 30% regular insulin
given to people who cannot afford NPH and regular separately, and elderly people, poor dexterity
Glargine (lantus), levemir
long acting insulin
Glargine onset
2-4 hr
Glargine peak
peakless
Glargine duration
20-24
levemir onset
2hr
levemir peak
peakless
levemir duration
24hr
insulin patient education
disposal of needles and syringes storage of syringes do not reuse needles calculation of insulin adjustment: 1-2 unit increase every 3-4 days correct lows first
Insulin A/E
hypoglycemia
lipodystrophy – give less injections at the site
atrodystrophy – give more injections at the site
regular insulin route
IV or subQ
Glargine/ Levemir education
keep extra bottles in refrigerator, any bottle that is being used should be kept outside of the refrigerator and is good for 30 days
refrigerated insulin causes
hyperdystrophy, and atrodystrophy
Thyrotoxicosis– Afib treatment
propranolol