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Year : 2017  |  Volume : 6  |  Issue : 4  |  Page : 208-215

Drug-drug interactions: experience at a tertiary care hospital

1 Department of Clinical Pharmacology and Therapeutics, Nizam's Institute of Medical Sciences, Hyderabad, India
2 Department of General Medicine, Nizam's Institute of Medical Sciences, Hyderabad, India

Correspondence Address:
M.V.S Subbalaxmi
Additional Professor, Department of General Medicine, Nizam's Institute of Medical Sciences, Hyderabad
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Source of Support: None, Conflict of Interest: None

DOI: 10.15380/2277-5706.JCSR.17.01.002

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Background: Drug-drug interaction (DDI) is one important factor that influences relationship between prescribed dose and drug-effects by interfering with either pharmacokinetics or pharmacodynamics of the co-administered drug. DDIs can cause toxicity or inhibit the drug effect, both of which have deleterious effect on patient care. This study was done to report the impact of prevention of DDIs. Methods: In this retrospective study, demographic details, relevant clinical information of the cases with suspected DDIs and the opinion given regarding suspected DDIs, with anticipated outcomes and further management were recorded and analyzed. Results: Of the 124 cases, 21 (16.9%) cases had suspected DDIs, among them 5 (23.8%) were pharmacodynamic and 13 (61.9%) were pharmacokinetic. Of the 21 DDIs, in 38.1% interactions, concomitant administration of interacting drugs was to be avoided and in 33.3% interactions, monitoring of effect was necessary to guide dosage adjustment. In ten (47.6%) cases, the DDIs were identified on day one and necessary action was taken to prevent the deleterious outcome and in rest of the 11 (52.4%) cases, adverse events have occurred due to DDIs, for which most of the patients were hospitalized. Conclusion: The present demonstrated that early identification of DDIs on day one, could prevent undesired consequences in 10 cases (47.6%). As DDIs is an important factor that can be prevented, if identified early, clinicians should be vigilant regarding DDIs when more than two drugs are prescribed.

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