Why morning empty stomach?

Thyroid hormone replacement

Levothyroxine

Brand examples (illustrative): Thyrox · Eltroxin (examples)

Daily thyroid hormone for hypothyroidism — timing and consistency decide success.

Updated: 15 August 2026 · Review: pending — placeholder

Educational information only. Medication decisions should be made with a qualified healthcare professional. This page provides no personalised doses and never advises starting, stopping or changing prescriptions. In case of side effects or overdose, seek care promptly.

Common indications & general mechanism

Hypothyroidism (primary treatment)
Post-thyroidectomy replacement
Selected thyroid nodule/goitre care

How it generally works: Replaces deficient thyroxine (T4), restoring metabolism.

Side effects & serious effects

Common

Palpitations, tremor if dose too high
Hair shedding transiently on correction

Serious (seek care)

Atrial fibrillation / bone loss with chronic overtreatment

Contraindications, interactions & monitoring

Who should not use / needs caution

Untreated adrenal insufficiency
Acute heart attack (initiate cautiously)

Drug interactions

Iron, calcium, antacids (separate by 4 hours)
Tea/coffee/milk reduce absorption
PPIs, estrogen, seizure medicines may alter need

Food interactions

Take 30–60 min before breakfast with water only

Monitoring

TSH 6–8 weeks after dose change, then 6–12 monthly

Pregnancy, kidney/liver & warnings

Pregnancy: Essential in pregnancy — dose often needs increase; inform your doctor immediately if pregnant.
Kidney/liver: Heart disease: start low, go slow.

Important warnings

Do not adjust dose on symptoms alone — TSH guides dosing.
Take same brand consistently if possible.

Common misconceptions

Myth: Thyroid medicine can be stopped once TSH is normal.

Fact: Normal TSH usually means the dose is working — stopping typically brings relapse.

FAQs

Food, chai, coffee and minerals block absorption. Water-only, then wait 30–60 min before breakfast.

References

ATA Hypothyroidism Guidelines — ATA

Related conditions & tests

Hypothyroidism Thyroid Nodules TSH Lipids

This website provides general educational information and is not a substitute for professional medical diagnosis, treatment or emergency care. Always consult a qualified healthcare professional.

Contraindications, interactions & monitoring

Who should not use / needs caution

Untreated adrenal insufficiency
Acute heart attack (initiate cautiously)

Drug interactions

Iron, calcium, antacids (separate by 4 hours)
Tea/coffee/milk reduce absorption
PPIs, estrogen, seizure medicines may alter need

Food interactions

Take 30–60 min before breakfast with water only

Monitoring

TSH 6–8 weeks after dose change, then 6–12 monthly