SAFE — No Known Interaction
🟢 SAFE — Levothyroxine and Methadone can be taken together safely.
Evidence level: MODERATE
Levothyroxine and Methadone are generally considered safe to use together based on current medical evidence. No adverse interactions have been reported.
No clinically significant interaction between Levothyroxine and Methadone has been identified in medical literature or FDA drug labeling.
Levothyroxine and Methadone do not have a documented clinically significant interaction. Continue both as prescribed. As a general rule, inform every prescriber about all medications you take, including those from other doctors.
Take Levothyroxine on an empty stomach in the morning. Methadone follows its own prescribed schedule. Opioids can slow GI motility, which may slightly delay thyroid absorption — maintain consistent timing for reliable levels.
Higher risk for: elderly, opioid-naive patients, those with sleep apnea, respiratory conditions, concurrent CNS depressants (benzodiazepines, alcohol), liver impairment, or history of substance use disorder.
Monitor thyroid function when combining Levothyroxine with Methadone. Some medications can alter thyroid hormone levels or metabolism. Watch for hypo symptoms (fatigue, weight gain, cold sensitivity, constipation) or hyper symptoms (anxiety, rapid pulse, weight loss, tremors, heat intolerance). Get thyroid levels (TSH, free T4) rechecked 6-8 weeks after starting or stopping the combination. When to seek emergency help: Chest pain, rapid or irregular heartbeat, high fever with confusion, or severe swelling of the neck.
No urgent need to discuss, but always keep your doctor informed of your full supplement and medication list. Say: "I take Levothyroxine and Methadone — is that OK?"
These medications are safe to take together at standard doses. Continue taking as prescribed and keep your pharmacist informed of your complete medication list.
Levothyroxine and Methadone are generally considered safe to use together based on current medical evidence. No adverse interactions have been reported.
Take Levothyroxine on an empty stomach in the morning. Methadone follows its own prescribed schedule. Opioids can slow GI motility, which may slightly delay thyroid absorption — maintain consistent timing for reliable levels.
Monitor thyroid function when combining Levothyroxine with Methadone. Some medications can alter thyroid hormone levels or metabolism. Watch for hypo symptoms (fatigue, weight gain, cold sensitivity, constipation) or hyper symptoms (anxiety, rapid pulse, weight loss, tremors, heat intolerance). Get thyroid levels (TSH, free T4) rechecked 6-8 weeks after starting or stopping the combination. When to seek emergency help: Chest pain, rapid or irregular heartbeat, high fever with confusion, or severe swelling of the neck.
These medications are safe to take together at standard doses. Continue taking as prescribed and keep your pharmacist informed of your complete medication list.
No urgent need to discuss, but always keep your doctor informed of your full supplement and medication list. Say: "I take Levothyroxine and Methadone — is that OK?"
Or browse the full interaction database (121,000+ pairs).