This is what I found on the web.
Avoid drinking alcohol, which can increase some of the side effects of Cialis.
Grapefruit and grapefruit juice may interact with Cialis. Discuss the use of grapefruit products with your doctor. Do not increase or decrease the amount of grapefruit products in your diet without first talking to your doctor.
Avoid using other medicines to treat impotence, such as alprostadil (Caverject, Muse, Edex) or yohimbine (Yocon, Yodoxin, others), without first talking to your doctor
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