20. Common medications Flashcards
Describe this medication: acyclovir (Zovirax®)
- Action
- Dosing
- Indications
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I)
- Action:
- Antiviral; inhibits DNA synthesis and viral replication
- Dosing:
- First Episode: 400 mg PO tid x 7-10 d
- Recurrence: 400 mg PO tid x 5 d
- Indications: Genital herpes
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I):
- S/E: headache, GI upset
- D/I: zidovudine, probenecid
Describe this medication: bromocriptine (Parlodel®)
- Action
- Dosing
- Indications
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I)
- Action:
- Dopaminomimetic, agonist at D2R and antagonist at D1R; acts directly on anterior pituitary cells to inhibit synthesis and release of prolactin
- Dosing:
- Initial: 1.25-2.5 mg PO qhs with food. Then: increase by 2.5 mg every 2-7 d as needed until optimal therapeutic response
- Usual Range: 1.5-15 mg OD
- For IVF:
- Initial: 1.25 mg/d PO between days 4-6 of follicular phase
- Then: 2.5 mg/d until 3 d after onset menstruation
- Indications:
- Galactorrhea + amenorrhea
- 2° to hyperprolactinemia
- Prolactin-dependent menstrual disorders and infertility
- Prolactin-secreting adenomas (microadenomas, prior to surgery of macroadenomas)
- IVF
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I):
- S/E: N/V, headache, postural hypotension, somnolence
- C/I: uncontrolled HTN, pregnancy-induced HTN, CAD, breastfeeding
- D/I: domperidone, macrolides, octreotide
Describe this medication: clomiphene citrate (Clomid®)
- Action
- Dosing
- Indications
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I)
- Action: Increases output of pituitary gonadotropins to induce ovulation
- Dosing: 50 mg OD x 5 d
Try 100 mg or 160 mg OD
If ineffective 3 courses: adequate trial
- Indications: Patients with persistent ovulatory dysfunction (e.g. amenorrhea, PCOS) who desire pregnancy
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I):
- S/E: Common: hot flashes, abdominal
discomfort, exaggerated cyclic ovarian enlargement, accentuation of Mittelschmerz
Rare: ovarian hyperstimulation syndrome,
multiple pregnancy, visual blurring, birth defects - C/I: pregnancy, liver disease, hormone-dependent tumours, ovarian cyst, undiagnosed vaginal bleeding
- S/E: Common: hot flashes, abdominal
Describe this medication: clotrimazole (Canesten®)
- Action
- Dosing
- Indications
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I)
- Action: Antifungal; disrupt fungal cell membrane
- Dosing:
- Tablet: 100 mg/d intravaginally x 7 d or 200 mg/d x 3d or 500 mg x 1 dose
- Cream (1 or 2%): 1 applicator intravaginally qhsx3-7d
- Topical: apply bid x 7 d
- Indications: Vulvovaginal candidiasis
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I): S/E: vulvar/vaginal burning
Describe this medication: danazol (Cyclomen® [CAN]) (Danocrine® [US])
- Action
- Dosing
- Indications
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I)
- Action: Synthetic steroid: inhibits pituitary gonadotropin output and ovarian steroid synthesis Has mild androgenic properties
- Dosing:
- 200-800 mg in 2-3 divided doses
- Use for 3-6 mo
- Biannual hepatic U/S required if >6 mo use
- Indications:
- Endometriosis
- 1° menorrhagia/DUB
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I):
- S/E: weight gain, acne, mild hirsutism, hepatic dysfunction
- C/I: pregnancy, undiagnosed vaginal bleeding, breastfeeding, severely impaired renal/hepatic/cardiac function, porphyria, genital neoplasia, thromboembolic disease
- D/I: warfarin, carbamazepine, cyclosporine, tacrolimus, anti-hypertensives
Describe this medication: doxycycline
- Action
- Dosing
- Indications
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I)
- Action: Tetracycline derivative; inhibit protein synthesis
- Dosing: 100 mg PO bid x ≥7 d
- Indications: Chlamydia, gonococcal infection, syphilis
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I):
- S/E: GI upset, hepatotoxicity
- C/I: pregnancy, severe hepatic dysfunction
- D/I: warfarin, digoxin
Describe this medication: fluconazole (Diflucan®)
- Action
- Dosing
- Indications
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I)
- Action: Antifungal; disrupt fungal cell membrane
- Dosing: 150mgPOx1dose
- Indications: Vulvovaginal candidiasis unresponsive to clotrimazole
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I):
- S/E: headache, rash, N/V, abdominal pain, diarrhea
- D/I: terfenadine, cisapride, astemizole, hydrochlorothiazide, phenytoin, warfarin, rifampin
Describe this medication: leuprolide (Lupron®)
- Action
- Dosing
- Indications
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I)
- Action: Synthetic GnRH analog; induces reversible hypoestrogenic state
- Dosing:
- 3.75 mg IM q1mo or 11.25 mg IM q3mo
- Usually ≤6 mo, check bone density if >6 mo
- Retreatment with Lupron® alone not recommended because of effects on bone density
- Indications:
- Endometriosis
- Leiomyomata
- dysfunctional uterine bleeding (DUB)
- Precocious puberty
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I):
- S/E: hot flashes, sweats, headache, vaginitis, reduction in bone density, acne, GI upset
- C/I: pregnancy, undiagnosed vaginal bleeding, breastfeeding
Describe this medication: menotropin (Pergonal®)
- Action
- Dosing
- Indications
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I)
- Action: Human gonadotropin with FSH and LH effects; induce ovulation and stimulate ovarian follicle development
- Dosing: 75-150 U of FSH and LH IM OD x 7-12d, then 10,000 U HCG 1 d after last dose
- Indications: Infertility
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I):
- S/E: bloating, irritation at injection site, abdominal/pelvic pain, headache, N/V, multiple pregnancy
- C/I: primary ovarian failure, intracranial lesion (e.g. pituitary tumour), uncontrolled thyroid/adrenal dysfunction, ovarian cyst (not PCOS), pregnancy, undiagnosed uterine bleeding
Describe this medication: metronidazole (Flagyl®)
- Action
- Dosing
- Indications
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I)
- Action: Bactericidal; forms toxic metabolites which damage bacterial DNA
- Dosing: 2 g PO x 1 dose or 500 mg PO bid x 7 d
- Indications: Bacterial vaginosis, trichomonas vaginitis
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I):
- S/E: headache, dizziness, N/V, diarrhea, disulfiram-like reaction (flushing, tachycardia, N/V)
- C/I: pregnancy (1st trimester)
- D/I: cisapride, warfarin, cimetidine, lithium, alcohol, amiodarone, milk thistle, carbamazepine
Describe this medication: oxybutinin (Ditropan®)
- Action
- Dosing
- Indications
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I)
- Action: Anticholinergic; relaxes bladder smooth muscle, inhibits involuntary detrusor contraction
- Dosing:
- 5 or 10 mg/d PO
- May increase doses by 5 mg weekly to a max of 30 mg/d
- Indications: Overactive bladder (urge incontinence)
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I):
- S/E: dry mouth/eyes, constipation, palpitations, urinary retention, dizziness, headache
- C/I: glaucoma, GI ileus, severe colitis, obstructive uropathy, use with caution if impaired hepatic/renal function
Describe this medication: tolterodine (Detrol®)
- Action
- Dosing
- Indications
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I)
- Action: Anticholinergic
- Dosing: 1-2 mg PO bid
- Indications: Overactive bladder (urge incontinence)
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I):
- S/E: anaphylaxis, psychosis, tachycardia, dry mouth/ eyes, headache, constipation, urinary retention, chest pain, abdominal pain
- C/I: glaucoma, gastric/urinary retention, use with caution if impaired hepatic/renal function
Describe this medication: tranexamic acid (Cyklokapron®)
- Action
- Dosing
- Indications
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I)
- Action: Anti-fibrinolytic; reversibly inhibits plasminogen activation
- Dosing:
- 1-1.5 g tid-qid for first 4 d of cycle
- Max 4 g/d
- Ophthalmic check if used for several wk
- Indications: Menorrhagia
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I):
- S/E: N/V, diarrhea, dizziness, rare cases of thrombosis, abdominal pain, MSK pain
- C/I: thromboembolic disease, acquired disturbances of colour vision, subarachnoid hemorrhage, age <15 yr
Describe this medication: ulipristal acetate (Fibristal®)
- Action
- Dosing
- Indications
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I)
- Action: Selective progesterone receptor modulator (SPRM)
- Dosing: 5 mg PO OD for max 3 mo; first tablet taken anytime during first 7 d of menstruation
- Indications: Leiomyoma (pre-operative)
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I):
- S/E: headache, hot flushes, constipation, vertigo, endometrial thickening
- C/I: pregnancy, undiagnosed vaginal bleeding, any gynecological cancer
Describe this medication: urofollitropin (Metrodin®)
- Action
- Dosing
- Indications
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I)
- Action: FSH
- Dosing: 75 U/d SC x 7-12d
- Indications: Ovulation induction in PCOS
- Side Effects (S/E), Contraindications (C/I), Drug Interactions (D/I):
- S/E: ovarian enlargement or cysts, edema and pain at injection site, arterial thromboembolism, fever, abdominal pain, headache, multiple pregnancy
- C/I: primary ovarian failure, intracranial lesion (e.g. pituitary tumour), uncontrolled thyroid/adrenal dysfunction, ovarian cyst (not PCOS), pregnancy, abnormal uterine bleeding