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Subjects were administered a single dose of 0.4 mg sublingual nitroglycerin (NTG) at pre-specified timepoints, following their last dose of tadalafil (2, 4, 8, 24, 48, 72, and 96 hours after tadalafil). At 48 hours, by most hemodynamic measures, the interaction between tadalafil and NTGwas not observed, although a few more tadalafil subjects compared to placebo experienced greater blood-pressure lowering at this timepoint. After 48 hours, the interaction was not detectable ( see Figure 1). Just like Viagra and Sildenafil, Cialis contains a PDE5-inhibitor as the only active ingredient. PDE5 is a chemical which reduces your ability to gain an erection. PDE5-inhibitors block this particular chemical, which means that the arteries in your penis are more relaxed and the blood flow is increased.
It eliminates the necessity to "plan ahead" and allows spontaneous sex from 30 minutes after you have taken the tablet. When taken correctly, Cialis should begin to work within minutes. The effects of one Cialis tablet can last up to 36 hours