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For the 20 subjects who received Viagra 100 mg and matching placebo, the placebo-subtracted mean maximum decreases from baseline (95% CI) in systolic blood pressure were as follows:The active ingredient in CIALIS tablets, tadalafil, belongs to a group of medicines called phosphodiesterase type 5 inhibitors. side affects of viagra

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Patients already taking tadalafil who require strong CYP3A4 inhibitor: Avoid using tadalafil while starting strong CYP3A4 inhibitor; stop tadalafil ≥24 hours before starting strong CYP3A4 inhibitor; after 1 week, resume tadalafil at 20 mg PO once daily; may be increased to 40 mg/day on basis of tolerability

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