 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  doctor. It is unknown if this drug passes into breast milk. Consult your doctor before breast-feeding.The interactions of Fesoterodine Oral: Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval. Some products that may interact with this drug include: pramlintide, potassium tablets/capsules, other drugs that can cause dry mouth and constipation (including anticholinergic medications such as atropine/scopolamine, antihistamines such as diphenhydramine, other antispasmodics including dicyclomine, belladonna alkaloids). Other medications can affect the removal of fesoterodine from your body, which may affect how fesoterodine works. Examples include certain azole antifungals (such as itraconazole, ketoconazole), mifepristone, among others. Tell your doctor or pharmacist if you are </s>