Sexual dysfunction in females can be complex, and there are often several contributing factors. Therefore, inhibitors of these isoenzymes may reduce sildenafil clearance and inducers of these isoenzymes may increase sildenafil clearance. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. A review article indicated that evidence from randomized controlled trials shows that sildenafil citrate is moderately effective in treating FSAD. In vivo studies: No significant interactions were shown with tolbutamide mg or warfarin 40 mg , both of which are metabolized by CYP2C9. If you are taking sildenafil to treat erectile dysfunction, follow your doctor’s directions and the guidelines in this paragraph.Sildenafil citrate is a white to off-white crystalline powder with a solubility of mg/mL in water and a molecular weight of VIAGRA is formulated as blue, film-coated rounded-diamond-shaped tablets equivalent to 25 mg, 50 mg and mg of sildenafil for oral administration. Viagra has even been tried as a treatment for sexual dysfunction in women. However, the U.S. Food and Drug Administration (FDA) hasn’t approved this use of Viagra. Indeed, for . The Food and Drug Administration (FDA) has not approved Viagra (sildenafil) for use in women. However, your healthcare provider may prescribe it for off-label use in female .