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At a lower dose, sildenafil is approved to treat pulmonary arterial hypertension—the higher dose is reserved for treating erectile dysfunction (ED). Anawalt explains that there's a chance your insurance might not cover it to treat ED. 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.
Sildenafil citrate is a white to off-white crystalline powder with a solubility of mg/mL in water and a molecular weight of .