You can take sildenafil with or without food. Side Effects Along with its needed effects, a medicine may cause some unwanted effects. Talk to your doctor if you take too much sildenafil and you’re worried about any of these side effects: headaches. Read more on male sexual health on the Sexual Health Australia site. Before taking sildenafil, tell your doctor and pharmacist if you are allergic to sildenafil, any other medications, or any of the ingredients in sildenafil tablet or suspension. Remove the cap by pushing it down and twisting it counter-clockwise.Sildenafil (Viagra brand) increases blood flow to the penis following sexual stimulation. It does this by blocking the enzyme responsible for the breakdown of cGMP. cGMP is a . Mild side effects of Viagra can include:*. headache. flushing. indigestion. mild and temporary vision changes, such as a blue tinge in your vision, blurred vision, and . Viagra (sildenafil) is a prescription drug that’s used to treat erectile dysfunction (ED). The drug comes as a tablet you’ll take by swallowing. It’s usually taken as needed about 1 hour.

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