Your primary care doctor should always know what medications you’re taking, including ED pills prescribed by another provider. However, others work on a cash-pay basis and don’t partner with insurance companies. Prolonged erection: If an erection lasts longer than 4 hours a rare occurrence , seek immediate medical assistance. Yes, ED pills can cause side effects. At the same time, they want to avoid any prefixes or suffixes that may have negative, derogatory, or offensive connotations. It’s available in 25 mg, 50 mg, and mg tablets and lasts up to 18 hours.Mind, Body, Wonder. How did Viagra become ‘Viagra’? Through this fascinating process. There’s an art and a science to naming pharmaceutical drugs. Here’s what is embedded in the name on. VIAGRA can cause your blood pressure to drop suddenly to an unsafe level if taken with certain other medicines. Do not take VIAGRA if you take any other medicines called “nitrates.” Nitrates are used to treat chest pain (angina). A sudden drop in blood pressure can cause you to feel dizzy, faint, or have a heart attack or stroke. You may report side effects to Health Canada at Precautions Before taking sildenafil, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies.