Drug General Information (ID: DDIT4D5Z3H)
Drug Name			Methazolamide		Drug Info		Amiodarone		Drug Info
Drug Type		Small molecule				Small molecule
Therapeutic Class		Carbonic Anhydrase Inhibitors				Antiarrhythmic Agents
Structure

Mechanism of Methazolamide-Amiodarone Interaction (Severity Level: Major)
Increased risk of ventricular arrhythmias Click to Show/Hide Mechanism Graph
Drug Name		Methazolamide				Amiodarone
Mechanism 1		Hypokalemia				Prolong QT interval
Key Mechanism Factor 1
		Factor Name		Ventricular arrhythmias
		Factor Description		Ventricular arrhythmias are abnormal heart rhythms that cause your heart's lower chambers to pump blood instead of pumping it. This can limit or stop your heart from supplying blood to your body. While some of these arrhythmias are harmless and do not cause symptoms, others can have serious, even fatal, effects on your body.
Mechanism Description		Increased risk of ventricular arrhythmias by the combination of Methazolamide and Amiodarone
Mechanism 2		Hypomagnesemia				Prolong QT interval
Key Mechanism Factor 2
		Factor Name		Ventricular arrhythmias
		Factor Description		Ventricular arrhythmias are abnormal heart rhythms that cause your heart's lower chambers to pump blood instead of pumping it. This can limit or stop your heart from supplying blood to your body. While some of these arrhythmias are harmless and do not cause symptoms, others can have serious, even fatal, effects on your body.
Mechanism Description		Increased risk of ventricular arrhythmias by the combination of Methazolamide and Amiodarone

Recommended Action
Management		Coadministration of amiodarone with medications that can cause potassium and/or magnesium disturbances should generally be avoided. Serum electrolytes should be evaluated and any abnormalities corrected prior to initiating therapy with amiodarone. Patients should be advised to seek medical attention if they experience symptoms that could indicate the occurrence of torsades de pointes such as dizziness, palpitations, or syncope.

References
1	Antonelli D, Atar S, Freedberg NA, Rosenfeld T "Torsade de pointes in patients on chronic amiodarone treatment: contributing factors and drug interactions." Isr Med Assoc J 7 (2005): 163-5. [PMID: 15792261]
2	Product Information. Amiodarone Hydrochloride (amiodarone). Bedford Laboratories, Bedford, OH.