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Some side effects, however, are more serious, such as priapism (a prolonged and sometimes painful erection that lasts for more than four hours) or sudden vision or hearing loss. Cialis can cause blood pressure to drop suddenly to an unsafe level if taken with certain other medicines. Do not use Cialis or other ED medications with nitrates (a drug often prescribed for angina and other heart problems) or guanylate cyclase stimulators (a treatment for pulmonary hypertension). Tadalafil is a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5). The physiologic mechanism of erection of the penis involves release of nitric oxide (NO) in the corpus cavernosum during sexual stimulation.

Rarely, sudden decreased vision, including permanent blindness, in one or both eyes (NAION) may occur. If this serious problem occurs, stop taking tadalafil and get medical help right away. You have a slightly greater chance of developing NAION if you have heart disease, diabetes, high cholesterol, certain other eye problems ("crowded disk"), high blood pressure, if you are over 50, or if you smoke. If you are taking tadalafil to treat both ED and BPH, take it as directed by your doctor, usually once a day. You may attempt sexual activity at any time between your doses.

Cialis is a substrate of and predominantly metabolized by CYP3A4. Studies have shown that drugs that inhibit CYP3A4 can increase tadalafil exposure. The following adverse reactions have been identified during post approval use of Cialis. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. These events have been chosen for inclusion either due to their seriousness, reporting frequency, lack of clear alternative causation, or a combination of these factors.

Tadalafil is a selective phosphodiesterase (PDE) type 5 inhibitor similar to sildenafil and vardenafil. It is administered orally for the treatment of male erectile dysfunction (ED), pulmonary arterial hypertension (PAH), benign prostatic hypertrophy (BPH), or the concurrent treatment of erectile dysfunction and BPH. Tadalafil does not inhibit prostaglandins as do some agents for treating impotence (e.g., alprostadil). Unlike sildenafil, visual disturbances have not been reported with tadalafil, which is more selective for PDE5 than for PDE6 present in the retina.

Our doctors review all orders and issue new or repeat prescriptions online direct to our pharmacy. A 10mg or 20mg tablet taken on Friday evening will usually remain active through a whole weekend until Sunday morning, hence the name. All men who are troubled by erectile dysfunction, which can be a distressing problem, should consult a doctor for a full assessment and advice. Men suffering from erectile dysfunction should inform their GP who will undertake an assessment, possibly perform tests, and provide advice. According to the manufacturer, the decision to breastfeed during therapy should consider the risk of infant exposure, the benefits of breastfeeding to the infant, and the benefits of treatment to the mother. Tadalafil was shown to decrease sperm concentrations in some but not all studies