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# Megestrol Acetate
## Overview
Megestrol acetate is a synthetic progestin with antiandrogenic and antineoplastic activity. It is primarily used for palliative treatment of advanced breast cancer and in cachexia associated with acquired immunodeficiency syndrome (AIDS).
## Primary Indications
* Palliative treatment of advanced, recurrent, or metastatic breast cancer in postmenopausal women.
* Treatment of cachexia, anorexia, or unexplained significant weight loss in patients with acquired immunodeficiency syndrome (AIDS).
## Adult Dosing
* **Breast Cancer:** 40 mg orally once daily. Higher doses may be used.
* **AIDS Cachexia:** 800 mg orally once daily.
## Pediatric Dosing
There is no established pediatric dosing for megestrol acetate.
## Dose Adjustments
* **Renal Impairment:** No specific dose adjustment is recommended.
* **Hepatic Impairment:** No specific dose adjustment is recommended, but caution is advised.
## Contraindications
* Known or suspected pregnancy.
* Known hypersensitivity to megestrol acetate or any component of the formulation.
## Adverse Effects
Common adverse effects include:
* Weight gain (often due to fluid retention and increased appetite)
* Hot flashes
* Hypertension
* Dyspnea
* Nausea
* Diarrhea
* Rash
* Sexual dysfunction
* Thromboembolic events (e.g., deep vein thrombosis, pulmonary embolism)
* Adrenal insufficiency (particularly with abrupt withdrawal after prolonged use)
* Cushingoid effects
## Key Drug Interactions
* **CYP3A4 Inhibitors/Inducers:** May alter megestrol acetate plasma concentrations. Monitor for efficacy and toxicity.
* **Aminoglutethimide:** May decrease serum concentrations of megestrol acetate.
## Monitoring
* **Breast Cancer:** Monitor for tumor response, signs of disease progression, and adverse effects.
* **AIDS Cachexia:** Monitor for weight gain, appetite, and adverse effects.
* **General:** Monitor for signs and symptoms of thromboembolic events, adrenal insufficiency, and Cushingoid effects. Blood pressure should be monitored regularly.
## Clinical Pearls
* Megestrol acetate can cause significant weight gain, primarily due to increased appetite and fluid retention.
* Abrupt discontinuation after prolonged use may lead to adrenal insufficiency. Tapering the dose is recommended.
* Use with caution in patients with a history of thromboembolic disease.
* Effective contraception should be used by patients of childbearing potential.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant literature before making clinical decisions. Dosing and recommendations may vary based on patient-specific factors and local protocols.*
