Physicians should advise patients to stop use of all PDE5 inhibitors, including CIALIS, and seek medical attention in the event of a sudden loss of vision in one or both eyes. Be aware that the rules the CBP agents follow change often and without notice, so it’s important to contact the CBP for timely information. The U. The interaction of tadalafil with alcohol was evaluated in 3 clinical pharmacology studies. Prolonged Erection There have been rare reports of prolonged erections greater than 4 hours and priapism painful erections greater than 6 hours in duration for this class of compounds. FDA is committed to protecting public health by working to secure the drug supply chain against counterfeit and unapproved medications that enter the United States through fraudulent sources. Customs officials will generally want a letter from the individual patient stating that the drug from a Mexican pharmacy is intended for personal use to treat a serious medical condition.CIALIS is indicated for the treatment of ED and the signs and symptoms of BPH (ED/BPH). Limitation of Use. If CIALIS is used with finasteride to initiate BPH treatment, such use is recommended for up to 26 weeks because the incremental benefit of CIALIS decreases from 4 weeks until 26 weeks, and the incremental benefit of CIALIS beyond. This article discusses how to use a Mexican pharmacy. It also explains the legality of buying medications in Mexico and the rules regarding crossing the border with pharmaceuticals. Please note that the rules often change without notice, so it’s important to . Cialis (tadalafil) is a prescription drug used to treat erectile dysfunction and benign prostatic hyperplasia. Cialis can cause side effects that range from mild to serious. Examples include.