As with any drug there are some side affects to be aware of for those people who may be taking Cialis and enjoying a more fulfilling sex life. Side effects can range from mild to the very dangerous. Most doctors are concerned with lasting side effects rather then those that appear quickly. In common with any prescribed drug, lasting side effects can show up many years later. The response of both drug companies and the Food and Drug Administration is to attempt to follow newer drugs for side effects that occur down the line, but drugs associated with penile dysfunction can be difficult to track because many men will not report it.

Cialis can cause your blood pressure to drop suddenly to an unsafe level if it is taken with certain other medicines and it is always important that you should always discuss taking this medicine with your doctor.

Who then should not take Cialis? A number of risk factors have shown themselves over the years. Men who are taking medicines called nitrates  should not take Cialis. Nitrates are prescribes for coronary heart disease such as angina and adversely affect your body when mixed with Cialis. Anyone using recreational drugs should not take Cialis. Many of these so called recreational drugs contain amyl nitrite and butyl nitrate and these can have a counter reaction when used while taking Cialis.

The active ingredient of Cialis can, according to the manufacturers, remain in your body for more than 2 days. The active ingredient can remain longer if you have problems with your kidneys or liver. It is for this reason that you cannot take Cialis and then take other drugs believing that it is out of your system.

Because of health problems, if you have been told by your doctor to not have sexual activity, you should not take Cialis. This is all the important for those who cannot have sexual relations because their doctor is concerned about the strain it may put on their heart. Cialis causes a chemical and physical reaction that can add to strain on your heart.

The following are other health issues you should inform your doctor about before taking Cialis:

• If you have low blood pressure or have high blood pressure
• Stroke victims
• Suffer liver problems
• Require dialysis or have kidney problems
• Suffer from stomach ulcers
• Have a bleeding problem
• Have a deformed penis shape or Peyronie's disease

 You must tell your doctor about any medical problems you may have and all of the medicines you take before requesting Cialis. You should always make informed decisions about your medications.