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# Megestrol Acetate
## Overview
Megestrol acetate is a synthetic progestin used primarily for palliative treatment of advanced breast cancer and endometrial cancer, as well as for management of anorexia, cachexia, or unexplained weight loss in patients with AIDS.
## Primary Indications
* Palliative treatment of advanced hormone-responsive breast cancer.
* Palliative treatment of advanced endometrial carcinoma.
* Treatment of anorexia, cachexia, or unexplained weight loss associated with acquired immunodeficiency syndrome (AIDS).
## Adult Dosing
* **Breast Cancer:** 160 mg daily.
* **Endometrial Cancer:** 40 mg four times daily (total 160 mg daily).
* **AIDS-related Cachexia/Anorexia:** 400-800 mg daily.
## Pediatric Dosing
The safety and efficacy of megestrol acetate have not been established in pediatric patients.
## Dose Adjustments
No dose adjustments are routinely recommended based on age or organ dysfunction, but caution is advised in patients with hepatic impairment.
## Contraindications
* Known hypersensitivity to megestrol acetate or any component of the formulation.
* Pregnancy and breastfeeding.
## Adverse Effects
Common adverse effects include weight gain, increased appetite, edema, hot flashes, dyspnea, nausea, vaginal bleeding, and hypertension. More serious adverse effects can include thromboembolic events (e.g., deep vein thrombosis, pulmonary embolism), adrenal insufficiency, and hyperglycemia.
## Key Drug Interactions
* **CYP3A4 Inhibitors/Inducers:** May alter megestrol acetate concentrations.
* **Insulin/Oral Hypoglycemics:** May require dose adjustments due to potential hyperglycemia.
## Monitoring
* Monitor for signs of thromboembolic events (e.g., leg swelling, shortness of breath, chest pain).
* Monitor weight and appetite.
* Monitor blood glucose levels, especially in patients with diabetes or at risk.
* Monitor for signs of adrenal insufficiency (e.g., fatigue, weakness, nausea, vomiting, hypotension), particularly with prolonged use or abrupt discontinuation.
## Clinical Pearls
* Megestrol acetate is a potent appetite stimulant.
* Ensure patients are aware of the potential for weight gain and edema.
* Advise patients to report any signs of blood clots immediately.
* Discontinuation of therapy should be gradual, especially after long-term use, to avoid potential adrenal insufficiency.
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*Disclaimer: This information is intended for clinical use and does not substitute for professional medical advice. Always consult the most current prescribing information and relevant guidelines before making treatment decisions.*
