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Cialis (Tadalafil) is an orally administered drug used to treat male erectile dysfunction (impotence). It was initially developed by the biotechnology firm ICOS and subsequently developed and marketed worldwide by a joint venture of ICOS Corporation and Eli Lilly and Company (Lilly ICOS LLC) under the brand name Cialis.

In the United States, Cialis (Tadalafil) has Food and Drug Administration approval and became available in December, 2003 as the third impotence pill after sildenafil (Viagra) and vardenafil (Levitra). Due to its 36-hour effect it is also known as the weekend pill. As with sildenafil and vardenafil, it is recommended that Cialis (Tadalafil) be used no more than once daily. Cialis (Tadalafil) is also currently undergoing Phase 3 clinical trials for the treatment of pulmonary arterial hypertension.

Although Viagra, Levitra, and Cialis all work by inhibition of PDE5, Cialis (Tadalafil)'s distinguishing pharmacologic feature is its longer half-life (17.5 hours) compared with Viagra and Levitra (4-5 hours). This longer half-life results in a longer duration of action and is, in part, responsible for the Cialis nickname of the "weekend pill." This longer half-life also is the basis of current investigation for Cialis (Tadalafil)'s use in pulmonary arterial hypertension as a once-daily therapy. At present, sildenafil (trade name Revatio) is approved in various regions worldwide as a 3-times daily therapy for pulmonary arterial hypertension.

Penile erection during sexual stimulation is caused by increased penile blood flow resulting from the relaxation of penile arteries and corpus cavernosal smooth muscle. This response is mediated by the release of nitric oxide (NO) from nerve terminals and endothelial cells, which stimulates the synthesis of cGMP in smooth muscle cells. Cyclic GMP causes smooth muscle relaxation and increased blood flow into the corpus cavernosum. The inhibition of phosphodiesterase type 5 (PDE5) enhances erectile function by increasing the amount of cGMP. Cialis (Tadalafil) (as well as sildenafil and vardenafil) inhibits PDE5. Because sexual stimulation is required to initiate the local release of nitric oxide, the inhibition of PDE5 by Cialis (Tadalafil) has no effect in the absence of sexual stimulation. The recommended starting dose of Cialis in most patients is 10 mg, taken as needed before anticipated sexual activity (but no more than once daily). The dose may be increased to 20 mg or decreased to 5 mg, based on individual efficacy and tolerability. To avoid the inconvience of men with erectile dysfunction needing to plan use of Cialis around anticipated sexual activity, Lilly ICOS embarked upon a clinical development program to evaluate the benefits and risks of chronic (once-a-day) use. In June 2007, the European Commission approved low-dose (2.5 mg and 5 mg) Cialis to be used as a once-a-day therapy for men with erectile dysfunction.

Cialis (Tadalafil) is currently undergoing clinical trials for the treatment of pulmonary arterial hypertension. In patients with pulmonary arterial hypertension, it is believed that there is an imablance of the PDE5/NO system in the pulmonary vasculature that favors selective vasoconstriction of the pulmonary artery. Investigation of Cialis (Tadalafil) in this disease assumes that PDE5 inhibition will result in pulmonary artery vasodilation, thus lowering pulmonary artery pressure and pulmonary vascular resistance. These physiologic changes may then reduce the workload of the right ventricle of the heart. Right heart failure is the main consequence of pulmonary arterial hypertension.

Cialis (Tadalafil) has been used in approximately 15,000 men participating in clinical trials, and over 8 million men wordwide (primarily in the post-approval/post-marketing setting). The most common side effects when using Cialis (Tadalafil) are headache, indigestion, back pain, muscle aches, flushing, and stuffy or runny nose. These side effects reflect the ability of PDE5 inhibition to vasodilate (cause blood vessels to widen) and usually go away after a few hours. Back pain and muscle aches can occur 12 to 24 hours after taking the drug, and the symptom usually disappears after 48 hours.

In May 2005, the U.S. Food and Drug Administration found that Cialis (Tadalafil) (along with other PDE5 inhibitors) was associated with vision impairment related to NAION (non-arteritic anterior ischemic optic neuropathy) in certain patients taking these drugs in the post-marketing (outside of clinical trials) setting. Most, but not all, of these patients had underlying anatomic or vascular risk factors for development of NAION unrelated to PDE5 use, including: low cup to disc ratio (“crowded disc”), age over 50, diabetes, hypertension, coronary artery disease, hyperlipidemia and smoking. Given the small number of NAION events with PDE5 use (less than 1 in 1 million), the large number of users of PDE5 inhibitors (millions) and the fact that this event occurs in a similar population to those who do not take these medicines, the FDA concluded that they were not able to draw a cause and effect relationship, given these patients underlying vascular risk factors or anatomical defects. However, the label of all three PDE5 inhibitors was changed to highlight clinicians to a possible association.

What is the shelf life of the pills?

• The expiry date is mentioned on each blister. It is different for different batches. The shelf life is 2 years from the date of manufacture and would differ from batch to batch depending on when they were manufactured.