PDE5 inhibitor
Vardenafil with thyroid medication (levothyroxine)
Levothyroxine is one of the most prescribed medications worldwide, and many adults on it also use chronic medications such as Vardenafil (Vardenafil). 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 5mg, 10mg, 20mg.
How Vardenafil affects thyroid medication
Levothyroxine absorption is sensitive to timing relative to food, calcium, iron and several medications. Whether Vardenafil interferes depends on Vardenafil — most agents in PDE5 inhibitor have no clinically meaningful effect on thyroid hormone levels, but a small number affect TSH or T4 free fraction. Vardenafil selectively inhibits PDE5, the enzyme that breaks down cyclic guanosine monophosphate in the corpus cavernosum.
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. Vardenafil at 5mg, 10mg, 20mg can usually be taken at any time relative to the levothyroxine dose, but the prescribing information for Vardenafil should be checked for specific timing instructions.
Frequently asked questions
Will Vardenafil affect my thyroid levels? ▾
Most PDE5 inhibitor medications do not directly affect thyroid hormone levels at 5mg, 10mg, 20mg. 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 Vardenafil relative to levothyroxine? ▾
Levothyroxine is taken on an empty stomach with at least a 30-minute fast and 4-hour separation from interacting medications. Vardenafil at 5mg, 10mg, 20mg usually has no specific timing constraint relative to levothyroxine; the pharmacist confirms based on the prescribing information for Vardenafil.
Products containing Vardenafil
More on Vardenafil
- With alcoholVardenafil and alcohol — is it safe to drink?
- With foodShould Vardenafil be taken with food?
- Side effectsVardenafil side effects: common, rare and warning signs
- Dosage guideVardenafil dosage guide: how much to take and when
- OnsetHow fast does Vardenafil start working?
- DurationHow long does Vardenafil last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.