Cialis is a phosphodiesterase inhibitor that causes muscles to relax and increases the blood flow towards particular areas of the human body. This medication is particularly helpful when the need arises to increas the blood flow into the penis in the process of sexual stimulation, hence its great popularity in the area of erectile dysfunction treatment. With the help of Cialis an erection can be achieved quite easily and maintained throughout the intercourse.

It is unadvisable to take Cialis with nitrat drugs such as nitroglycerin and its derivatives, isosorbide dinitrate and isosorbide mononitrate which are generally used for chest pains caused by heart problems. Combining Cialis and medicines from this list can bring about t serious decrease in blood pressure.

Side effects of this medication include dizziness, nausea, numbness and/or pain in varous body parts. If you have noticed any of these, contact your doctor. Also, seek medical help if after taking Cialis your erection lasts over 4 hours. In extremely rare cases taking Cialis can result in sudden sight-loss caused by the decrease of the blood flow towards the optic nerve.

It is important to always take Cialis following the doctor's instructions precisely. Always allow at least 24 hours to pass in between pills.