Suhagra belongs to a group of medicines called phosphodiesterase type-5 (PDE 5) inhibitors which are mainly used to treat erectile dysfunction (impotence) in adult men. Suhagra 100 works by relaxing the blood vessels in the penis, allowing blood to flow into the penis when a person is sexually aroused. The effect of this medicine lasts for 4 to 6 hours. You can take this medicine before or after food. You can take this medicine as per the doctor's advice.