Thyroid hormone replacement
Levothyroxine when planning pregnancy
For couples trying to conceive, every chronic medication deserves a careful pre-pregnancy review. Levothyroxine (Levothyroxine) at 25mcg, 50mcg, 75mcg, 100mcg, 150mcg may need to be continued, switched, or stopped before conception, depending on the active ingredient Levothyroxine and the indication. The right answer is rarely the same for everyone and rarely "just stop the medication."
Pre-conception review of Levothyroxine
According to the prescribing information for Levothyroxine, the pre-conception decision balances the risk of the medication during pregnancy against the consequences of leaving the underlying condition untreated. Some Thyroid hormone replacement medications are continued safely through pregnancy; others are switched to safer alternatives before conception or in early pregnancy. Levothyroxine replaces deficient endogenous thyroxine, which is converted in tissues to the active hormone triiodothyronine (T3) by deiodinase enzymes.
Effect on fertility itself
Some medications affect fertility directly — by altering ovulation, sperm parameters, hormonal balance or libido. Whether Levothyroxine has any documented effect on fertility depends on Levothyroxine; the prescribing information notes any data. Anyone trying to conceive should discuss Levothyroxine with the prescriber and a fertility specialist if conception is taking longer than expected.
Frequently asked questions
Should I stop Levothyroxine before trying to conceive? ▾
It depends on Levothyroxine and the indication. For some medications the answer is yes — switch to a safer alternative weeks before conception. For others, continuation is safe and preferable. The prescriber decides based on the full clinical picture.
Does Levothyroxine affect male fertility? ▾
Effects on male fertility depend on the active ingredient. Some medications in Thyroid hormone replacement affect sperm parameters or libido; others have no documented effect. The prescribing information for Levothyroxine states what is known. If conception is delayed, a semen analysis can clarify whether Levothyroxine is contributing.
Products containing Levothyroxine
More on Levothyroxine
- With alcoholLevothyroxine and alcohol — is it safe to drink?
- With foodShould Levothyroxine be taken with food?
- Side effectsLevothyroxine side effects: common, rare and warning signs
- Dosage guideLevothyroxine dosage guide: how much to take and when
- OnsetHow fast does Levothyroxine start working?
- DurationHow long does Levothyroxine last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.