Your primary care doctor should always know what medications you’re taking, including ED pills prescribed by another provider. Payment options: Consider how you’d like to pay. ED medications can cause side effects, and it’s crucial to have access to a medical provider if needed. Yes, ED pills can cause side effects. Never purchase ED medications from a site or service that doesn’t require a prescription and medical documentation. What Are the Symptoms of Erectile Dysfunction? ED medications can cause side effects, and it’s crucial to have access to a medical provider if needed.This drug is more popular than comparable drugs. It is available in generic and brand versions. Generic sildenafil is covered by most Medicare and insurance plans, but some pharmacy coupons or cash prices may be lower. Get sildenafil for as low as $, which is 99% off the average retail price of $ for the most common version, by using. · You can take the drug 30 minutes to 4 hours before you anticipate sexual activity. Based on how well you respond to this dosage and any side effects you have, your doctor may either increase your. Side Effects. Dizziness, headache, flushing, or stomach upset may occur. Vision changes such as increased sensitivity to light, blurred vision, or trouble telling blue and green colors apart may.