Oral ED medicines might not work or might be dangerous if you also take any of the following: Nitrate medicines. However, others work on a cash-pay basis and don’t partner with insurance companies. Severe liver disease. People with heart conditions should never take ED medications without consulting a doctor. These small differences affect the way each medication works, such as how quickly it takes effect and wears off, and the possible side effects. The specific process for getting ED pills online depends on your chosen provider. This boosts blood flow and helps you get an erection from sexual activity.Typical dosing for Sildenafil (Viagra) The typical dose is to take 50 mg of sildenafil (Viagra) by mouth, about 1 hour before sex, as needed. The maximum .  · There’s a Free, Low-Risk Alternative to Viagra, Study Shows. Regular exercise sessions can be as effective as popping Viagra pills when it comes to dealing . Still, if your doctor says it’s okay for you to use and you end up paying out-of-pocket, you can still get the generic for a lot less than Viagra. According to price .