Norepinephrine-dopamine reuptake inhibitor (NDRI) antidepressant
Bupropion with thyroid medication (levothyroxine)
Levothyroxine is one of the most prescribed medications worldwide, and many adults on it also use chronic medications such as Bupropion (Bupropion). The combination is generally safe, but levothyroxine's narrow therapeutic index and finicky absorption mean a few practical points matter more than for most other co-administered drugs at 75mg, 100mg, 150mg, 300mg.
How Bupropion affects thyroid medication
Levothyroxine absorption is sensitive to timing relative to food, calcium, iron and several medications. Whether Bupropion interferes depends on Bupropion — most agents in Norepinephrine-dopamine reuptake inhibitor (NDRI) antidepressant have no clinically meaningful effect on thyroid hormone levels, but a small number affect TSH or T4 free fraction. Bupropion inhibits the reuptake of norepinephrine and dopamine, with much weaker effect on serotonin reuptake.
Practical timing
According to standard endocrine practice, levothyroxine is taken on an empty stomach at least 30 minutes before food and 4 hours from interacting medications. Bupropion at 75mg, 100mg, 150mg, 300mg can usually be taken at any time relative to the levothyroxine dose, but the prescribing information for Bupropion should be checked for specific timing instructions.
Frequently asked questions
Will Bupropion affect my thyroid levels? ▾
Most Norepinephrine-dopamine reuptake inhibitor (NDRI) antidepressant medications do not directly affect thyroid hormone levels at 75mg, 100mg, 150mg, 300mg. Some affect TSH testing, hormone-binding proteins or T4 free fraction in subtle ways. Routine thyroid function tests every few months catch any meaningful drift.
When should I take Bupropion relative to levothyroxine? ▾
Levothyroxine is taken on an empty stomach with at least a 30-minute fast and 4-hour separation from interacting medications. Bupropion at 75mg, 100mg, 150mg, 300mg usually has no specific timing constraint relative to levothyroxine; the pharmacist confirms based on the prescribing information for Bupropion.
Products containing Bupropion
More on Bupropion
- With alcoholBupropion and alcohol — is it safe to drink?
- With foodShould Bupropion be taken with food?
- Side effectsBupropion side effects: common, rare and warning signs
- Dosage guideBupropion dosage guide: how much to take and when
- OnsetHow fast does Bupropion start working?
- DurationHow long does Bupropion last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.