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| Heparin | Nitroglycerin | Verapamil | |
| Heparin | NA | Syringe – at least 5 min | Additive – 24 hours Syringe – at least 5 min |
| Nitroglycerin | Syringe – at least 5 min | NA | Additive – 24 hours |
| Verapamil | Additive – 24 hours Syringe – at least 5 min |
Additive– 24 hours | NA |
Note: additive = additive compatibility of both drugs in the same intravenous bag; NA = not applicable; syringe = compatibility of both drugs in the same syringe.
