MediHelp
Drug interactions A–Z
Known drug-drug interactions with severity, mechanism and clinical management.
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
- pantoprazole + warfarin moderate
- paracetamol + warfarin moderate
- paroxetine + tamoxifen major
- paroxetine + thioridazine contraindicated
- penicillin + tetracycline moderate
- phenelzine + sumatriptan contraindicated
- phenelzine + tramadol contraindicated
- Phenobarbital + Theophylline moderate
- phenytoin + trimethoprim-sulfamethoxazole major
- Phylloquinone + Warfarin major
- Piperacillin + Voriconazole moderate
- Piperacillin/Tazobactam + Voriconazole moderate
- Piroxicam + Tizanidine moderate
- posaconazole + rifampin major
- posaconazole + simvastatin contraindicated
- potassium chloride + spironolactone major
- prasugrel + warfarin major
- prazosin + sildenafil major
- prednisolone + ramipril moderate
- prednisolone + salbutamol moderate
- procarbazine + sertraline major
- propafenone + ritonavir major
- Propranolol + Sulpiride moderate
- proton pump inhibitor + warfarin moderate
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.