Indications
Treatment of metastatic prostate carcinoma in conjunction
with luteinizing hormone–releasing hormone
(LHRH) analogs (goserelin, leuprolide).
Action
Antagonizes the effects of androgen at the cellular level.
Therapeutic Effects: Decreased spread of prostate
carcinoma.
Pharmacokinetics
Absorption: Well absorbed after oral administration.
Distribution: Unknown.
Protein Binding: 96%.
Metabolism and Excretion: Mostly metabolized
by the liver.
Half-life: 5.8 days.
TIME/ACTION PROFILE (blood levels)
ROUTE ONSET PEAK DURATION
PO unknown 31.3 hr unknown
Contraindications/Precautions
Contraindicated in: Hypersensitivity; Women.
Use Cautiously in: Moderate to severe liver impairment;
Rep: Men with female partners of reproductive
potential; Pedi: Safety not established.
Adverse Reactions/Side Effects
CNS: weakness, dizziness, headache, insomnia. Resp:
dyspnea. CV: chest pain, hypertension, peripheral
edema. GI: HEPATOTOXICITY, constipation, diarrhea,
nausea, abdominal pain,qliver enzymes, vomiting.
GU: erectile dysfunction,pfertility, hematuria, incontinence,
nocturia, urinary tract infections. Derm: alopecia,
photosensitivity, rash, sweating. Endo: breast
pain, gynecomastia. Hemat: anemia.Metab: hyperglycemia,
weight loss. MS: back pain, pelvic pain, bone
pain. Neuro: paresthesia. Misc: generalized pain,
hot flashes, flu-like syndrome, infection.
Interactions
Drug-Drug: Mayqthe effect of warfarin.
Route/Dosage
PO (Adults): 50 mg once daily (must be given concurrently
with LHRH analog).
Availability (generic available)
Tablets: 50 mg.
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