Malegra 25 mg contains Sildenafil Citrate, the same active ingredient found in Viagra. This medication is used to treat erectile dysfunction (ED). The effects of Malegra 25 mg typically start within 30 to 60 minutes after ingestion. The medication usually begins to work within about 30 to 60 minutes after taking it. The effects generally last for about 4 to 6 hours. During this time, you can achieve and maintain an erection in response to sexual stimulation. If you have any concerns about how Malegra 25 is working for you or if you experience any side effects, consult with your healthcare provider.