Background: Although most cases of drug eruptions are mildand self-limited and are relieved after discontinuation of theresponsible drugs, statistics of life threatening outcomes shouldbe kept in mind. Moreover, it is important to identify the mostcommon age and sex groups, and the most vulnerable groupsin any area related to offending drugs. Thus, we collected thebasic information of patients with skin drug reactions who wereadmitted to Razi Hospital, Tehran, Iran, during 2010-2012 (18months).Method: In this study, all patients with a diagnosis of drugreactions who were admitted to Razi Hospital, Tehran, Iran,during 2010-2012 (18 months) were enrolled. The types of drugsand skin reaction manifestations were reported.Result: One hundred and thirty one patients were admitted witha diagnosis of drug reactions. The mean age of the participantswas 40 years. Forty one patients were male (31.3%) and 90 werefemale (68.3%). Antibiotics and anticonvulsants were the mostcommon drugs associated with reactions. Carbamazepine wasthe most common drug that caused reactions (21 cases, 17.4%)followed by penicillin (20 cases, 16.5%), and lamotrigine (16 cases,13.2%). Morbilliform rash (40 cases, 30.5%), erythroderma (18cases, 13.7%), and urticaria/angioedema (14 cases, 10.7%) werethe most common patterns of skin involvement.Conclusion: The results of our study are consistent with the resultsof other studies. It is recommended that drugs that commonlycause adverse reactions be prescribed with more precautionin females aged 20-40 years, and if possible, be replaced withappropriate drugs. Moreover, it is recommended that patients whoare allergic to these drugs carry a certain card that demonstratestheir sensitivity.