Zenegra 50 mg is a prescription medicine containing sildenafil 50 mg, commonly used to treat erectile dysfunction (ED) in adult men. Current Indian pharmacy listings identify Alkem Laboratories Ltd. as the manufacturer/marketer of Zenegra 50 mg. The medicine works by increasing blood flow to the ***** during ***** stimulation, helping a man achieve and maintain an erection. It belongs to a class of medicines called PDE-5 inhibitors. The product is manufactured in India. Some regulatory records also show Zenegra 50 associated with Ratnamani Healthcare Pvt. Ltd., indicating that manufacturing arrangements may vary by market or product registration. Important: Zenegra 50 mg should be used only as directed by a doctor. Sildenafil can interact dangerously with nitrate medicines used for chest pain, so medical advice is important before use.