Prolonged post-operative hydrocodone usage due to psychotropic drug interaction

Area of Science:

• Pharmacology
• Pain Management
• Drug Interactions

Background:

• Hydrocodone is commonly prescribed for pain management after orthopedic surgery.
• Psychotropic medications are frequently co-prescribed with opioids.
• Cytochrome P450 2D6 (CYP2D6) is involved in the metabolism of many drugs, including hydrocodone and some psychotropic medications.

Purpose of the Study:

• To investigate the impact of CYP2D6 inhibition by psychotropic medications on pain outcomes and hydrocodone use in patients undergoing orthopedic surgery.
• To identify potential drug-drug interactions affecting post-operative pain management.

Main Methods:

• A retrospective study of 224 patients hospitalized for upper extremity injuries who received hydrocodone and a psychotropic medication.
• Patients were categorized based on whether their psychotropic medication inhibited CYP2D6 (n=178) or not (n=46).
• Data on demographics, in-hospital pain, and post-discharge opioid use were collected via electronic health records and interviews.

Main Results:

• Patients on CYP2D6-inhibiting psychotropic medications had significantly longer post-discharge opioid use (median 33 days) compared to non-inhibitor users (median 4 days).
• No significant differences were found in in-hospital pain outcomes, hydrocodone dosage, or side effect occurrence between the groups.
• A higher likelihood of continued hydrocodone use up to 3 months post-surgery was observed in patients taking CYP2D6 inhibitors.

Conclusions:

• Co-prescription of hydrocodone with CYP2D6-inhibiting psychotropic medications is associated with prolonged opioid use post-orthopedic surgery.
• Awareness of these drug-drug interactions is crucial for optimizing clinical practice and improving patient pain management.
• This interaction poses a risk for extended hydrocodone use and potentially poorer post-operative pain outcomes.