Table 3.

Comparison of correct rate in DDIs knowledge.

Drug – drug combinations	Correct answer (%)	Incorrect answer (%)	P value
Warfarin and cimetidine	59.7	40 0.3	<0.0001
Sildenafil and isosorbide mononitrate	74.6	25.4	<0.0001
Conjugated estrogens and raloxifen	27.2	72.8	<0.0001
Fexofenadine HCL and metoprolol	43.8	56.2	<0.0001
Theophylline and ciprofloxacin	35	65	<0.0001
Pimozide and ketoconazole	32.5	67.5	<0.0001
Methyldopa and phenobarbital	17.7	82.3	<0.0001
Phenytoin and cimetidine	30.7	69.3	<0.0001
Itraconazole and quinidine	37.8.	62.2	<0.0001
Amiodarone and simvastatin	43.1	56.9	<0.0001
Methotrexate and probenecid	21.2	78.8	<0.0001
Diphenhydramine and warfarin	30.7	69.3	<0.0001
Raloxifene and alendronate	32.3	67.8	<0.0001
Warfarin and diflunisal	37.5	62.5	<0.0001
Amiodarone and fluconazole	16.3	83.7	0.0004
Theophylline and omeprazole	34.3	65.7	<0.0001
Sulfinpyrazone and warfarin	31.4	68.6	<0.0001
Meperidine and phenelzine	44.2	55.8	<0.0001
Fluconazole and phenytoin	37.8	62.2	<0.0001
Warfarin and nortriptyline	51.6	48.4	<0.0001
Amoxicillin and acetaminophen with codeine	69.6	30.4	<0.0001
Digoxin and clarithromycin	39.9	60.1	<0.0001
Alprazolam and itraconazole	25.4	74.6	<0.0001
Dopamine and phenytoin	40.3	59.7	<0.0001
Ciprofloxacin and tizanidine	24.7	75.3	<0.0001
Cyclosporine and rifampicin	31.1	68.9	<0.0001