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GLP-1 Calculators

GLP-1 Before Pregnancy — Taper Timeline for Semaglutide and Tirzepatide (2026)

Plan a safe GLP-1 taper before TTC. Semaglutide ≥ 2 months; tirzepatide ≥ 1 month; liraglutide shorter. Includes resume-after-nursing scheduling.

Updated April 2026

Medical disclaimer: This tool is for informational purposes. Not medical advice. Consult your healthcare provider before starting, stopping, or changing any medication. Drug prices, savings cards, and coverage policies change frequently — verify current pricing directly with the manufacturer or your pharmacy.

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Results

Wash-out period
8 weeks
Stop before trying to conceive
Drug half-life
7 days
TTC after stop
8 wks
GLP-1s are contraindicated in pregnancy. The FDA recommends stopping at least 8 weeks before conception for semaglutide and tirzepatide. Always plan this with your OB-GYN.

Why the 2-month and 1-month windows

GLP-1 drugs have long half-lives. Semaglutide’s half-life is approximately one week, which means it takes around 5 half-lives (5 weeks) to reach 97% clearance from circulation. Tirzepatide clears faster. FDA labeling builds a safety buffer on top of pharmacokinetic clearance to account for individual variation and for the drug’s effects on fetal environment in early organogenesis.

A typical pre-conception taper

  1. Month -3 (semaglutide): Drop from maintenance dose to one step below for 4 weeks.
  2. Month -2: Final dose, then stop entirely. Appetite returns over weeks.
  3. Month -1: Drug clearing. Focus on protein, resistance training, weight stabilization.
  4. Month 0: TTC window opens. Ovulation typically tracks well in patients with normalized cycles.

Tirzepatide uses a compressed version of the same sequence (1 month off minimum).

Managing appetite rebound during the wash-out

The biggest practical challenge during the wash-out window is appetite rebound. Ghrelin and leptin signaling return within 2–6 weeks of discontinuation; appetite typically returns faster than basal metabolic rate re-adapts. Strategies that work:

  • Protein-anchor every meal (25–40 g). Satiety effect stacks with reduced appetite.
  • Fiber 30+ g/day for gastric emptying and satiety.
  • Resistance training 3× weekly — metabolically expensive and appetite-neutral.
  • Sleep 7+ hours. Sleep loss spikes ghrelin.
  • Structured meal timing — skip-fasting discipline helps some patients; others do better with 4 small meals.

If pregnancy is unplanned while on therapy

Stop the GLP-1 immediately. Call your prescriber and your OB. The limited available registry data does not show a dramatic teratogenic signal, but pregnancy exposure is “avoid if possible” under current labeling. Early prenatal care and nutritional counseling matter more than retrospective guilt — most exposed pregnancies proceed normally.

Post-delivery resumption

If you’re not breastfeeding, most OBs clear GLP-1 resumption 2–4 weeks postpartum at your prior dose. If breastfeeding, plan to remain off until weaning. If regain during the full off-therapy window (taper + pregnancy + postpartum ± breastfeeding) is significant, you may need to re-titrate from a lower starting dose rather than jumping back to maintenance.

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Frequently asked questions

When do I need to stop GLP-1 before trying to conceive?

FDA labeling recommends discontinuing semaglutide (Wegovy, Ozempic) at least 2 months before a planned pregnancy because of its long half-life (~1 week — it takes ~5 half-lives to fully clear). Tirzepatide (Zepbound, Mounjaro) has a somewhat shorter half-life and the label calls for discontinuation at least 1 month before attempting. Liraglutide (Saxenda) clears faster (~13-hour half-life) so the window is shorter.

What if I get pregnant while on a GLP-1?

Stop the drug immediately and contact your prescriber. Pregnancy exposure to GLP-1s has limited human data. Registries are being built but current FDA labeling is 'not recommended' during pregnancy rather than a Category X ban. Your OB will want to know the dose, duration, and last injection date.

Does GLP-1 therapy improve or hurt fertility?

For PCOS patients with significant obesity, the net effect on fertility is usually positive — weight loss of 10%+ restores ovulation in 40–60% of previously anovulatory patients. But the drug itself must be discontinued before conception. The sequence is: GLP-1 → weight loss → discontinue GLP-1 → TTC with improved fertility.

Can I restart GLP-1 after delivery?

Yes, but not while breastfeeding. GLP-1s pass into milk in small amounts and human data is limited. Most clinicians advise discontinuing throughout breastfeeding and resuming after weaning. If you're bottle-feeding from delivery, you can often resume at your prior dose 2–4 weeks postpartum once cleared by your OB.

Will I regain weight during the pregnancy window off the drug?

Some regain is typical — STEP-4 and SURMOUNT-4 data shows ~two-thirds of prior loss regained within 12 months of discontinuation without intensive lifestyle maintenance. Protein intake, resistance training, and structured nutrition during the wash-out and pregnancy minimize regain. Pregnancy itself drives weight gain in the second and third trimesters, which is normal.

What if I need to lose more weight for fertility but pregnancy is time-sensitive?

This is a conversation with your reproductive endocrinologist. Some REIs accept a GLP-1 weight-loss pre-cycle with structured discontinuation 2 months before embryo transfer or IUI. Others prefer minimum 3 months off. Your fertility clinic's protocol will govern the timeline.

Is bariatric surgery a better fertility-focused alternative?

Sometimes. Bariatric surgery typically requires a 12–18 month pre-pregnancy window for full healing and weight stabilization. It's more durable than GLP-1 weight loss but much more invasive. GLP-1 to medical goal weight followed by discontinuation may be faster and lower-friction for many fertility patients.

Does the timeline change if I'm on a low dose?

No. The drug's half-life determines clearance, not the dose. 2 months off for any semaglutide dose; 1 month off for any tirzepatide dose. A brief dose taper in the 2–4 weeks before full discontinuation is clinically reasonable to ease GI rebound and appetite return.

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