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If the sildenafil response is not reliably improving erection, the physician should first check if the patient is taking the pill correctly. The physician should also check the patient’s testosterone level. One investigator in Italy gave testosterone to patients with low testosterone who did not respond to sildenafil (Viagra). The most common sexual dysfunctions in men include lack of interest, premature ejaculation and erectile dysfunction.

The rate and extent of absorption of tadalafil are not influenced by food