Can You Take Fluconazole 100 mg with Oxycodone?
Yes, you can take fluconazole 100 mg with oxycodone, as there is no clinically significant drug interaction between these two medications. Unlike some other opioids, oxycodone's metabolism is not substantially affected by fluconazole at standard doses, and this combination does not pose the same risks seen with other drug pairings.
Why This Combination Is Safe
Fluconazole does not significantly interact with oxycodone. While fluconazole is a moderate CYP3A4 inhibitor 1, and oxycodone is partially metabolized through this pathway, the clinical impact is minimal. The FDA label for fluconazole does not list oxycodone among the drugs requiring dose adjustment or special monitoring 1.
The key distinction here is that:
- Oxycodone is primarily metabolized through CYP2D6 (converting to oxymorphone, its active metabolite), with only secondary metabolism through CYP3A4 2, 3
- Fluconazole's inhibition of CYP3A4 does not substantially alter oxycodone's overall metabolism or clinical effects
- No dose adjustment of oxycodone is required when co-administered with fluconazole
Important Contrasts with Other Opioids
This safety profile differs markedly from other opioid combinations:
Methadone + Fluconazole requires extreme caution. Fluconazole significantly increases methadone levels by 35% (AUC increase), with peak concentrations rising 27% and trough levels increasing 48% 4. A case report documented respiratory depression requiring naloxone reversal when fluconazole was added to stable methadone therapy 5. If you were taking methadone instead of oxycodone, this would be a dangerous combination requiring close monitoring or dose reduction.
Fentanyl patches also warrant caution with fluconazole, though the interaction is less well-characterized than with methadone 6.
What You Should Monitor
While the combination is safe, standard opioid precautions apply:
- Watch for excessive sedation, confusion, or respiratory depression (slow or shallow breathing)
- Avoid combining with benzodiazepines (e.g., alprazolam, diazepam, lorazepam), as this creates high risk for respiratory depression regardless of fluconazole 7, 6
- Avoid alcohol while taking oxycodone
- Monitor for opioid side effects: constipation, nausea, dizziness
Fluconazole-Specific Considerations
Be aware that fluconazole can prolong the QT interval (heart rhythm abnormality), particularly at higher doses 1. While 100 mg is a relatively low dose, inform your prescriber if you:
- Have heart rhythm problems or structural heart disease
- Take other medications that prolong QT interval (amiodarone, certain antibiotics like clarithromycin, some antipsychotics)
- Have low potassium levels
Bottom Line
This combination does not require dose adjustment and can be taken safely together. The fluconazole 100 mg dose is on the lower end of the therapeutic range and poses minimal interaction risk with oxycodone. Continue both medications as prescribed, but maintain standard opioid safety precautions and avoid adding benzodiazepines or alcohol to this regimen.