Cialis (tadalafil) can be taken by people suffering from impotence. Erectile dysfunction is a condition that can be successfully treated when Cialis is used, as men diagnosed with this condition get an opportunity to have sex without being worried about the hardness of their erection and its durability. If you have any of the following symptoms while having sex – stop taking Cialis and talk to your doctor as soon as possible, as these symptoms may indicate something has gone wrong in your treatment: chest pain, dizziness, nausea, numbness or tingling in your jaw, neck, chest or arms. If you have a history of priapism (prolonged and painful erection), taking Cialis may not be completely safe for you, as the same reaction may happen again. Make sure you also tell your health care provider about other health conditions that may interfere with the effectiveness of your treatment. The following ones are important to mention: bleeding disorder, a history of a stroke, retinitis pigmentosa, chest pain, liver disease, stomach ulcer, kidney disease, heart rhythm problems, a recent history of a heart attack, heart disease, blood cell disorder, high or low blood pressure, a history of congestive heart failure, or a physical deformity of the penis. Some of these conditions may require additional tests. Taking Cialis can be associated with a number of serious and mild side effects. The following ones are very serious and you need to report them to your health care provider as soon as possible: sudden hearing loss, sudden vision loss, sweating, lightheadedness, convulsions, priapism, nausea, ringing in your ears, irregular heartbeat, chest pain, swelling in your hands, vision changes, and shortness of breath. However, Cialis is usually well tolerated and the side effects mentioned are unlikely. Mild side effects are possible at the beginning of your treatment, as your body needs some time to adjust to the dose prescribed. You can get some or any of the following side effects: stuffy nose, upset stomach, memory problems, diarrhea, back pain, headache, or muscle pain. In very rare cases these mild side effects change in intensity and begin to bother you. This is when you can report them to your health care provider to see if you need a dose adjustment. The dose you are prescribed is the lowest efficient dose that will help you deal with your impotence more effectively. It’s based on the full assessment of your health condition and needs to be observed very carefully to provide for maximum efficiency of Cialis. If you think you need to have your dose changed – talk to your doctor first. If you have recently taken a nitrate-based medicine, taking Cialis is not recommended to avoid serious and potentially lethal reactions, such as stroke or heart attack. These reactions have to do with a sudden drop in blood pressure. The following are most popularly prescribed nitrate-based medicines (usually intended for chest pain): isosorbide dinitrate, nitroglycerin and isosorbide mononitrate.