Concomitant administration with the following may result in increased Loperamide plasma levels: Ritonavir (used to treat Human Immunodeficiency Virus);Quinidine (used to treat abnormal heart rhythms); Oral desmopressin (used to treat excessive urination); Itraconazole or ketoconazole (used to treat fungal infections); Gemfibrozil (used to lower cholesterol).
Medicines that slow down the action of the stomach and intestines (e.g., some medicines for depression and cold and allergy medications) as these may increase the constipating effect of Loperamide.
Medicines that cause drowsiness since Loperamide may also cause drowsiness
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