Cialis (tadalafil) is a highly effective medicine to treat erectile dysfunction. You need to inform your doctor of being allergic to tadalafil or any other drugs of the kind. If you have high or low blood pressure, blood cell disorder, bleeding disorder, liver or kidney disease, angina, history of a recent stroke or heart rhythm problems, you need to mention these problems to your doctor so that he would be able to prescribe an optimum dose of the drug or consider an alternative if possible side effects and drug interaction are too dangerous.

Even though Cialis is not intended for women it has been classified by the FDA as pregnancy category B, which means it is not expected to be harmful to an unborn baby. It is unknown whether this medicine passes into breast milk, so in case you are breastfeeding it's recommended to talk to the doctor before starting the treatment. In very rare cases Cialis is thought to contribute to a sudden vision loss a result of a decrease of blood flow to the optic nerve. In most of the cases the patients affected were also older than 50, and had serious health issues, such as high blood pressure, high cholesterol, diabetes, heart disease, or pre-existing eye problems. If you experience sudden vision loss seek emergency medical help.