Tell your doctor about all your other medicines, especially:
an antidepressant;
medicine to treat mental illness;
cold or allergy medicine (Benadryl and others);
medicine to treat or prevent nausea and vomiting; or
an MAO inhibitor--isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, tranylcypromine, and others.
This list is not complete. Other drugs may affect hyoscyamine, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.
 Hyoscyamine drug interactions (more detail)
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