Levothyroxine is one of the most timing-sensitive medicines available. Getting the timing right is as important as the dose itself. Here is the definitive guide to when and how to take your thyroid medicine.
The Standard Protocol: Morning, Empty Stomach
The standard recommendation — supported by decades of evidence — is to take levothyroxine first thing in the morning, on an empty stomach, with a full glass of plain water. Then wait 30–60 minutes before eating anything, including tea or coffee.
The reason: food — particularly dairy, calcium-containing foods, and high-fibre foods — directly interferes with thyroid hormone absorption in the gut. The morning fasting window ensures maximum absorption.
What "Empty Stomach" Really Means
- No food or drink except plain water for 30–60 minutes before and after
- If you wake at 6 AM, take the tablet at 6 AM, eat at 6:45–7 AM
- Even black coffee reduces absorption — wait before your morning coffee
- Plain water only: not hot lemon water, not warm honey water, not juice
Alternative: Bedtime Dosing
For patients who find morning dosing difficult — those who must eat immediately on waking due to other medications, diabetes, or stomach issues — bedtime dosing is a validated alternative. Take the tablet at least 3–4 hours after your last meal (typically 10–11 PM on an empty stomach). Studies show bedtime dosing achieves equal or slightly better absorption than morning dosing when done correctly.
🩺 Which Option to Choose
I recommend morning dosing as the first choice for most patients because it's more consistent with daily habits. Bedtime dosing works well for patients on multiple morning medicines (like calcium, iron, or diabetes drugs that must also be taken on an empty stomach). Discuss with me which protocol fits your situation best.
Building the Habit
TSH Still Not Normal Despite Regular Medication?
Timing and food interactions are the most common culprits. Book a review — often a simple protocol change resolves the issue.