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After single oral-dose administration, the maximum observed plasma concentration (C) of tadalafil is achieved between 30 minutes and 6 hours (median time of 2 hours). Absolute bioavailability of tadalafil following oral dosing has not been determined. A study was conducted to assess the interaction of angiotensin II receptor blockers and tadalafil 20 mg. Subjects in the study were taking any marketed angiotensin II receptor blocker, either alone, as a component of a combination product, or as part of a multiple anti hypertensive regimen. Following dosing, ambulatory measurements of blood pressure revealed differences between tadalafil and placebo of 8/4 mm Hg in systolic/diastolic blood pressure. The placebo-subtracted mean maximal decreases in systolic blood pressure over a 12-hour period after dosing in the placebo-controlled portion of the study (part Cmax) are shown in Table 6 and Figure 3 .

How long a medication remains good can depend on many factors, including how and where you store the medication. If you have questions about using Cialis to treat ED after prostate surgery, talk with your doctor. After ejaculation, you’ll likely lose your erection even if you’re taking Cialis. You should take Cialis according to your doctor’s or healthcare professional’s instructions. It’s possible to get a prolonged erection that lasts more than 4 hours while taking Cialis. If you have heartburn that’s bothersome to you while taking Cialis, talk with your doctor.

The following adverse drug reactions and incidences are derived from product labeling unless otherwise specified. 20 to 40 mg every 24 hours