Njoi (Sildenafil citrate) tablets are a medicinal treatment containing the active ingredient Sildenafil Citrate, most commonly used to treat erectile dysfunction in adult men. Sildenafil works by relaxing blood vessels and improving blood flow to certain areas of the body, particularly the penis, helping to achieve and maintain an erection in response to sexual stimulation. The usual dosage of Njoi is one tablet taken as needed, about one hour before sexual activity, as advised by a healthcare professional. However, it should not be taken more than once a day. Side effects can include headaches, flushing, or upset stomach, and if an erection lasts longer than 4 hours, medical help should be sought immediately.