This may be your pill? The imprint SDF could easily be read as SOF.
Pill imprint SDF 20 has been identified as Sildenafil Citrate 20 mg.
It is a generic version of Revatio, which is used to treat pulmonary arterial hypertension. But the active ingredient is sildenafil, which is exactly the same as the active ingredient in Viagra. Viagra comes in strengths of 25 mg, 50 mg and 100 mg and is not yet available as a generic in the U.S.
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