Antidepressant Headaches in the First Weeks: What to Expect

Headaches are among the most consistently reported early effects of starting an antidepressant. NICE, NPS MedicineWise, and Royal College of Psychiatrists patient resources describe them as common in the first one to two weeks and typically resolving by the third week. They are a class-wide pattern, not specific to any one medication.

Why headaches appear early

Antidepressants alter serotonin availability throughout the body, including in blood vessels and pain-signalling pathways. Maudsley Prescribing Guidelines describe headache as a common transient effect of starting treatment, partly attributable to vascular changes and partly to the broader adjustment the nervous system makes in the first weeks. The headaches are usually mild to moderate — not migraine-class for most patients.

When they tend to settle

Most patients report headaches easing meaningfully by the end of week two. By week three, headaches are typically resolved for the majority. Persistent or severe headaches beyond the first two to three weeks warrant a conversation with the prescriber, who may consider dose timing, hydration, or other contributing factors.

What helps in the meantime

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Stay well hydrated. Dehydration amplifies headache severity. The basics matter more than usual in the first weeks while the nervous system is adjusting.

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Prioritise consistent sleep. Sleep deprivation lowers headache threshold. A regular sleep schedule reduces a common trigger during the adjustment period.

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Reduce caffeine gradually. Sudden caffeine changes are a well-documented headache trigger. Cutting back slowly avoids compounding the adjustment headaches.

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OTC analgesia where appropriate. Paracetamol or ibuprofen for short-term use is generally acceptable — confirm with your pharmacist to rule out interactions with your specific antidepressant.

What to flag to your prescriber

Raise these with your prescriber or seek care

Severe headache unlike any you have had before — do not wait for a follow-up appointment.
Headache accompanied by visual changes, confusion, or weakness anywhere in the body.
Headache persisting past week three with no improvement at all.
Sudden onset of the worst headache of your life — seek emergency care immediately.

Frequently asked questions

How long do antidepressant headaches last?

Most patients report meaningful improvement by week two and resolution by week three. Persistence past the first month is worth a prescriber conversation.

Can I take paracetamol or ibuprofen with my antidepressant?

Generally yes for short-term use, but confirm with your pharmacist as some antidepressants interact with certain pain medications, particularly NSAIDs. Your pharmacist can check for interactions specific to your medication.

Are these headaches a sign of something serious?

Rarely. Mild to moderate headaches in the first weeks are documented as a common transient effect across major clinical guidelines. Severe, sudden, or neurologically unusual headaches always warrant medical assessment.