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Three studies were conducted in men to assess the potential effect on sperm characteristics of tadalafil 10 mg (one 6 month study) and 20 mg (one 6 month and one 9 month study) administered daily. There were no adverse effects on sperm morphology or sperm motility in any of the three studies. In the study of 10 mg tadalafil for 6 months and the study of 20 mg tadalafil for 9 months, results showed a decrease in mean sperm concentrations relative to placebo, although these differences were not clinically meaningful. This effect was not seen in the study of 20 mg tadalafil taken for 6 months. In addition there was no adverse effect on mean concentrations of reproductive hormones, testosterone, luteinizing hormone or follicle stimulating hormone with either 10 or 20 mg of tadalafil compared to placebo. Endpoint [Change from baseline] 49% [6%] 57% [15%] 73% [29%]

CIALIS is not right for everyone. Only your healthcare provider and you can decide if CIALIS is right for you. Ask your healthcare provider if your heart is healthy enough for you to have sexual activity. Do not take CIALIS if your healthcare provider has told you not to have sexual activity because of your health problems. Before taking CIALIS, tell your healthcare provider about all your medical problems, particularly if you have or ever had: heart problems such as chest pain (angina), heart failure, irregular heartbeats, or heart attack pulmonary hypertension low blood pressure or high blood pressure that is not controlled stroke liver or kidney problems or require dialysis retinitis pigmentosa, a rare genetic (runs in families) eye disease severe vision loss, including a condition called NAION stomach ulcers or a bleeding problem a deformed penis shape or Peyronie’s disease an erection that lasted more than 4 hours blood cell problems such as sickle cell anemia, multiple myeloma, or leukemia cialis 40 mg dryness or soreness of the throatBefore taking this medicineKeep the tablets in their pack until it is time to take them. If you take your tablets out of the pack they will not keep as well.

Studies in vitro have demonstrated that tadalafil is a selective inhibitor of PDE5. PDE5 is found in platelets. When administered in combination with aspirin, tadalafil 20 mg did not prolong bleeding time, relative to aspirin alone. Cialis has not been administered to patients with bleeding disorders or significant active peptic ulceration. Although Cialis has not been shown to increase bleeding times in healthy subjects, use in patients with bleeding disorders or significant active peptic ulceration should be based upon a careful risk-benefit assessment and caution.Vardenafil was secreted into the milk of lactating rats at concentrations approximately 10-fold greater than found in the plasma. Following a single oral dose of 3 mg/kg, 3.3% of the administered dose was excreted into the milk within 24 hours. canadian pharmacy viagra

History of Viagra

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