Megestrol


Concise Prescribing Info
Indications/Uses
Listed in Dosage.
Dosage/Direction for Use
Adult : PO Palliation of breast carcinoma 40 mg 4 times/day. Palliation of endometrial carcinoma 40-320 mg/day in divided doses. Anorexia and cachexia in patients w/ cancer or AIDS Initial: 800 mg/day. Usual: 400-800 mg/day.
Dosage Details
Oral
Anorexia and cachexia in patients with cancer or AIDS
Adult: Initial: 800 mg daily. Usual range: 400-800 mg daily. As suspension containing 625 mg megestrol acetate in 5 ml: 625 mg daily.

Oral
Palliative treatment of breast carcinoma
Adult: 40 mg 4 times daily or 160 mg once daily.

Oral
Palliative treatment of endometrial carcinoma
Adult: 40-320 mg daily in divided doses.
Administration
Standard Formulation: Should be taken with food.
Megace Es: May be taken with or without food.
Contraindications
Pregnancy and lactation. Severe hepatic impairment.
Special Precautions
History of thrombophlebitis, mild to moderate hepatic impairment, risk of fluid retention, history of depression, diabetes, hypertension, renal or cardiac dysfunction.
Adverse Reactions
Acne, urticaria, fluid retention, wt gain, heart failure, nausea, vomiting, GI disturbances, changes in libido, breast discomfort, premenstrual symptoms, irregular menstrual cycles, depression, insomnia, somnolence, alopecia, hirsutism, anaphylactoid-like reaction, jaundice, hot flushes, adrenocortical suppression, carpal tunnel syndrome, hypercalcaemia, tumour flare, hypertension.
PO: X (for oral suspension), D (for  tablet)
Drug Interactions
Concentrations of indinavir may be reduced. Possible reduced efficacy of cisplatin. Warfarin half life may be increased. Megestrol concentration may be decreased by aminoglutethimide and enzyme-inducing drugs.
Action
Description: Megestrol is a progestogen used as an antineoplastic and appetite stimulant. The mechanism of it's antineoplastic effects is not known but may be due to inhibition of oestrogen synthesis, modulation of other steroid hormones and/or a direct cytotoxic effect on tumour cells.
Pharmacokinetics:
Absorption: Variable absorption from the GIT (oral); peak plasma concentrations after 1-3 hrs.
Distribution: Protein-binding: High.
Metabolism: Hepatic.
Excretion: Urine (as steroid metabolites and inactive compound), faeces.
Disclaimer: This information is independently developed by MIMS based on Megestrol from various references and is provided for your reference only. Therapeutic uses, prescribing information and product availability may vary between countries. Please refer to MIMS Product Monographs for specific and locally approved prescribing information. Although great effort has been made to ensure content accuracy, MIMS shall not be held responsible or liable for any claims or damages arising from the use or misuse of the information contained herein, its contents or omissions, or otherwise. Copyright © 2020 MIMS. All rights reserved. Powered by MIMS.com
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