Table 3. Distribution of drug-drug interactions detected using three software methods in prescriptions for adult and elderly patients, according to potential severity.

Prescription drugs		n	Potential severity
			Drugdigest Medscape Micromedex
Propranolol +	Methyldopa	4	Major	Major	Moderate
Propranolol +	Clonidine	1	Major	Major	Major
Digoxin +	Amiodarone	1	Major	Major	Major
Warfarin +	Amiodarone	1	Major	Major	Moderate