levothyroxine - injection, Levothroid, Synthroid (cont.)
DRUG INTERACTIONS: 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: androgens/anabolic steroids (e.g., testosterone), antidepressants (e.g., SSRIs such as sertraline, tricyclics such as amitriptyline), beta blockers (e.g., propranolol), corticosteroids (e.g., dexamethasone), cytokines (e.g., interferon alfa, interleukin-2), digoxin, drugs to treat diabetes (e.g., insulin, sulfonylureas such as glyburide), epinephrine, estrogen-containing products (e.g., birth control pills, hormone replacement therapy), ketamine, theophylline, warfarin, drugs that can decrease thyroid hormone levels (e.g., amiodarone, medications containing iodide/iodine, lithium), drugs affecting liver enzymes that remove levothyroxine from your body (e.g., phenobarbital, rifamycins including rifampin, certain anti-seizure medicines including carbamazepine and phenytoin).High doses of salicylates (e.g., high doses of aspirin) may affect thyroid hormone levels in the blood. However, low-dose aspirin should be continued if prescribed by your doctor for specific medical reasons such as heart attack or stroke prevention (usually at dosages of 81-325 milligrams per day). Ask your doctor or pharmacist for more details.Check the labels on all your medicines (e.g., cough-and-cold products, diet aids) because they may contain ingredients such as decongestants or caffeine that could increase your heart rate or blood pressure. Ask your pharmacist about using those products safely.
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