Remove the cap by pushing it down and twisting it counter-clockwise. Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil. Oral medicines for ED usually work well and cause few side effects. Oral ED medicines might not work or might be dangerous if you also take any of the following: Nitrate medicines. Click here for an email preview. You can take this medicine with or without food 30 minutes before sex, depending on the dose.Kamagra 50 MG Tablet contains Sildenafil. It is better known as the blue pill. It is an effective medicine used for the treatment of erectile dysfunction (ED) in men. Erectile dysfunction is a condition where a man is unable to achieve and/or maintain an erection adequate for sexual intercourse.  · For oral dosage form (tablets): Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 hour before sexual intercourse. Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. Your doctor may adjust your dose if needed. Kamagra 50 MG Tablet or Viagra is the most commonly used drug for the treatment of erectile dysfunction. It also treats other male sexual function problems. The sildenafil citrate is the salt form of the drug. It is generally used to increase blood flow to the penis to help a man sustain his erection to enhance sexual activity.