Cialis is a wonderful erectile dysfunction treatment drug; however you need to be very careful before you buy Cialis online from Cialis Pharmacy. Let’s look closely at some of its widely known effects and precautions. • It is known that a very small number of men have lost their eyesight after taking Cialis. This happens because blood flow is blocked to the optic nerve. People who have any kind of heart trouble, diabetes, high blood pressure, high cholesterol, or any eye problems are more likely to suffer from vision problem. Therefore they are advised not to take Cialis or if required only after consultation with a doctor. • People who are under any kind of medication (nitrates or alpha-blocker drugs) should not take Cialis. This is because the combination of these two drugs might result in sudden of blood pressure, which may lead to a heart attack or stroke. • Although Cialis can be taken with alcohol, intake of excessive amount of alcohol should be avoided. This increases the risk of headache, dizziness, increased heart rate, or low blood pressure. • Men over the age of 65 years are more likely to experience side effects from Cialis. They should check with a doctor to know the best dose of this medication. • Although the ill effects of Cialis have not be considered in women, it is generally recommended not be taken by women. • Grapefruit and grapefruit juice are likely to intermingle with Cialis. Their combination may lead to potentially adverse effects. • Sometimes the use of Cialis leads to uncommon erection that doesn’t go away. This condition is known as Priapism. Any such condition must be treated as soon as possible or lasting damage can happen to the penis. • Always remember Cialis is not a cure for ED. Also, it does not protect a man or his partner from sexually transmitted diseases, including HIV.