Side effects Side effects of oral ED medicines are often mild. It works for up to 36 hours. Oral medicine for ED also might not be safe or work well if you have: Very low blood pressure, called hypotension, or uncontrolled high blood pressure, called hypertension. Erectile dysfunction medications require a prescription from a licensed provider. The most common side effects of VIAGRA: headache; flushing; upset stomach; abnormal vision, such as changes in color vision such as having a blue color tinge and blurred vision; stuffy or runny nose; back pain; muscle pain; nausea; dizziness; rash. So in answer to the question: is Sildenafil just a cheaper version of Viagra?Learn More IF YOU CHOOSE BRAND-NAME VIAGRA, MAKE SURE YOU GET THE BRAND NAME Your prescription may have been filled with a generic version instead of . Sildenafil The original ED medication. Our average rating based on reviews. Express shipping US clinicians Starting from $ Get your treatment We’ll deliver to . Lemonaid can prescribe sildenafil (generic Viagra), tadalafil (generic Cialis), and vardenafil (generic Levitra). You can get a prescription online following a quick and easy visit with .

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