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Vardenafil is a generic drug, which is an exact copy of the active ingredient in a brand-name medication (in this case, Levitra, which is discontinued). Both Cialis and vardenafil belong to a group of medications called phosphodiesterase 5 (PDE5) inhibitors. This side effect was reported only in people who took Cialis once a day for erectile dysfunction (ED).

They’ll be able to determine whether the drugs may interact with Cialis and whether that may lead to an increased risk of side effects. If you have any questions about the best way to avoid specific side effects from Cialis, talk with your doctor. Cialis was shown in clinical trials to be an effective medication to treat ED. The drug was studied using part of a survey called the International Index of Erectile Function (IIEF). A higher score on the IIEF meant that erectile function was better, so ED symptoms were reduced. If you take tadalafil for pulmonary arterial hypertension, do not take Cialis® or other PDE5 inhibitors, including sildenafil (Revatio® or Viagra®) or vardenafil (Levitra®).

These adverse effects happen because Cialis causes vasodilation (widening of blood vessels). These side-effects usually disappear within 48 hours after you take the pill. Evidently, you should also be careful with the dosage — the wrong dosage can hurt even the healthiest patient. Cialis Professional, as the strongest and most powerful option, can produce negative effects, like the majority of drugs. Because of this, it’s crucial to discuss all of your prescription drugs and dietary supplements with a healthcare provider before you start using them.

This inhibition boosts the level of cyclic Guanosine Monophosphate (cGMP), which increases penile blood flow and helps attain and maintain an erection when sexual stimulation occurs. Like other ED treatments, it takes about 30 minutes to take effect. Cialis differs from Viagra and similar medications, as its effect lasts for up to 36 hours, which is why it is sometimes referred to as a "weekend pill". Our online service allows you to select and order a preferred treatment. Furthermore, the longer half-life is the basis for tadalafil's daily therapeutic use in treating pulmonary arterial hypertension.

This signal cascade is attenuated by PDE5 which breaks the phosphodiester bond of cGMP, converting it to GMP. Inhibition of PDE5 by tadalafil increases signaling via the PKG cascade which supports penile smooth muscle relaxation during sexual arousal by decreasing Ca2+ entry into smooth muscle cells. This smooth muscle relaxation allows blood to fill the corpus cavernosum thereby producing an erection. Tadalafil, as a selective PDE-5 inhibitor, has an effect similar to sildenafil and thus it decreases pulmonary hypertension by reducing hypoxic pulmonary vasoconstriction in HAPE (Schmidt, 2015