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Other causes may include spinal injury or operations on the prostate or bowel. Regular cycling for 3 or more hours a day may also contribute to ED. The most common side effect is a bluish or yellowish tinge to vision.

Alcohol makes it more difficult to get an erection even if you don’t have erectile dysfunction. So, it is best to avoid or limit your alcohol intake when using Viagra. Clinical studies have shown that Viagra 50mg is effective in 74% of men who take it. The 25mg dose is 62% effective and the highest dose (100mg) is 82% effective, compared to taking a placebo (a pill without medication in it).

If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. You should also be aware of the common and more serious side effects of tadalafil. The larger dose is effective for up to 36 hours, hence it’s popular nickname ‘The Weekender’.

Cialis should not be combined with Adcirca (another form of tadalafil) or other PDE5 inhibitors. Cialis is not approved for women and is not intended for use in women who are pregnant or breastfeeding. Caution is advised when PDE5 inhibitors are coadministered with alpha-blockers.

Erectile dysfunction (ED) is defined as the inability to achieve and maintain an erection sufficient for satisfactory sexual intercourse (1). Although ED is not life-threatening, it is closely related to the patient’s quality of life, sexual relationship and family stability (2). It is also an early warning sign of many physical diseases, such as stroke, tumors, Parkinson’s disease, and spinal cord disease, etc. (3). Estimates suggest that ED affects approximately 150 million men worldwide, and the rates of ED are expected to double by the year 2025 (4,5).

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.

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