Cialis (tadalafil) is one of the most popularly prescribed drugs that help patients taking it deal with their impotence and perform sexually in a way that allows getting satisfaction. Cialis has been reported to cause interference with some drugs. Make sure you are not taking any of the following medicines at the moment of stating your treatment with Cialis: doxazosin, rifampin, diclofenac, heart or blood pressure medications, prazosin, imatinib, conivaptan, seizure medications, terazosin, HIV/AIDS medicines, antidepressants, antibiotics, isoniazid, or antifungals. Any other anti-impotence medications you may be taking at the moment should be stopped, as Cialis can interfere with them as well. Although Cialis is relatively safe, there are still a number of side effects associated with it. You need to inform your doctor of any of the following side effects that are considered to be quite serious: sudden vision loss, sweating, vision changes, priapism, convulsions, lightheadedness, sudden hearing loss, swelling in your hands, chest pain, shortness of breath, and ringing in your ears. However, you are most likely to get a couple of mild side effects. It’s impossible to foresee which mild side effects you will get, but here are the most commonly reported ones for you to be aware of the possibility: headache, back pain, upset stomach, stuffy nose, muscle pain, diarrhea, sore throat, and warmth or redness in your face. People that have been advised to abstain from sexual activity are not supposed to take Cialis and have sex. Therefore, it’s important that you make sure you follow these recommendations in case of having been given them. If you experience nausea, chest pain, numbness or tingling in your jaw, neck, chest or arms, and dizziness while having sex – stop the activity and contact your doctor immediately, as these may be signs of a dangerous reaction to Cialis. Sudden vision loss is a rare condition reported by some people taking this medication, although it may be contributed to by a number of other factors, such as pre-existing eye problems, high blood pressure, being older than 50, heart disease, smoking regularly, and high cholesterol levels. If you have any of the health problems mentioned, make sure you talk to your doctor about all the risks and benefits of the treatment. Sudden vision loss is supposed to be reported as soon as possible to prevent this condition from getting worse. Cialis is not intended for women and is not supposed to be taken by them. If you are a woman (especially a pregnant woman) make sure you talk to your doctor before taking Cialis is you think you need to take it for whichever health problem.