SAFE — No Known Interaction
🟢 SAFE — Levothyroxine and Theophylline can be taken together safely.
Evidence level: MODERATE
Levothyroxine and Theophylline are generally considered safe to use together. No adverse interactions have been reported in medical literature.
No clinically significant interaction between Levothyroxine and Theophylline has been identified in medical literature.
No interaction documented between Levothyroxine and Theophylline. Always inform your healthcare provider about everything you take.
Take Levothyroxine on an empty stomach, 30-60 minutes before food or other medications. Space Theophylline at least 1-2 hours from your thyroid dose. Thyroid medications are highly sensitive to timing — consistency is critical for stable blood levels.
Higher risk for: elderly with cardiac conditions, those with adrenal insufficiency, recent thyroid dose adjustments, concurrent calcium/iron/antacid use (absorption interference), or narrow therapeutic index sensitivity.
Monitor thyroid function when combining Levothyroxine with Theophylline. 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 discussion needed, but keep your provider informed. Say: "I take Levothyroxine alongside Theophylline — anything I should know?"
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 Theophylline are generally considered safe to use together. No adverse interactions have been reported in medical literature.
Take Levothyroxine on an empty stomach, 30-60 minutes before food or other medications. Space Theophylline at least 1-2 hours from your thyroid dose. Thyroid medications are highly sensitive to timing — consistency is critical for stable blood levels.
Monitor thyroid function when combining Levothyroxine with Theophylline. 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 discussion needed, but keep your provider informed. Say: "I take Levothyroxine alongside Theophylline — anything I should know?"
Or browse the full interaction database (121,000+ pairs).