prov:value
| - Although the generic name sildenafil represents a free base, the present invention is also meant to encompass its pharmaceutically acceptable salts, such as hydrochloride, hydrobromide, hydroiodide, nitrate, sulfate, bisulfate, phosphate, acid phosphate, acetate, lactate, citrate, acid citrate, tartrate, bitartrate, salicylate, succinate, maleate, gluconate, methane sulfate, ethane sulfate, methan
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