If you and your doctor are planning to replace your monoamine oxidase inhibitor with amitriptyline, you will need to be off the monoamine oxidase inhibitor for at least two weeks. After that, you can start the Elavil very carefully, and gradually increase the dosage to the level determined by your doctor.
The heartburn medicine Cisapride has been taken off the market in many countries, including the United States. In addition, its use is severely limited in humans (it is used in cats as a hairball medicine). But if you do use Cisapride, you shouldn't also be taking Elavil or other amitriptyline. The combination may increase your risk for heart problems such as arrhythmia. If you have recently had a heart attack, use of Elavil, Endep, Vanatrip or other amitriptyline is not recommended.
Sources
Cisapride Medline Plus. Last Reviewed Sept 2008.
Riedl, MA, MD, Casillas, AM, MD Adverse Drug Reactions: Types and Treatment Options. American Family Physician. Nov 2003.
ELAVIL® (AMITRIPTYLINE HCI) Tablets and Injection Professional Information Brochure. FDA website. Last revised Dec 00.

