When choosing one, tell your doctor or other health care professional what your preferences are, such as cost, ease of use, how long the drug’s effects last and side effects. Your doctor or other health care professional can recommend one for you based on these factors, other health conditions you have and any other medicines you take. Medicines that you take by mouth are called oral medicines. You’ll want to make sure to inquire about the potential side effects, contraindications or conditions that make Viagra untenable for you, such as a history of heart problems, stroke, liver or kidney disease, etc. The most common symptoms of erectile dysfunction include difficulty achieving or maintaining an erection and reduced sexual desire. You can then ask your doctor if these might work for you. Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil.If you have these symptoms, stop taking VIAGRA and contact a doctor right away. medicines called alpha-blockers, such as Hytrin (terazosin HCl), Flomax (tamsulosin . Sildenafil (Viagra). This medicine works best when you take it on an empty stomach an hour before sex. The body takes longer to absorb it after a high-fat meal or . Cost Overdose Ask your doctor Q&A Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a .