In brief
- Botox is approved for chronic migraine, 15 or more headache days per month. It is not effective for episodic migraine, and that distinction decides both whether it works and whether insurance authorizes it.
- Do not expect relief in the first week. Improvement typically begins at 2 to 3 weeks and peaks near 6 weeks.
- Two full cycles are needed before judging whether Botox works for you.
- Seek emergency care immediately for difficulty swallowing or breathing. Do not wait for our office to open.
Understanding your diagnosis
Chronic migraine is defined as headache on 15 or more days per month for more than three months, with at least eight of those days carrying migraine features. It is a distinct condition, not simply more headaches. Repeated attacks progressively sensitize the trigeminal nerve system, so the pain pathway fires more easily, more often, and to smaller triggers, a process called central sensitization.
Botox is approved specifically for chronic migraine. It is not effective for episodic migraine (fewer than 15 headache days per month), and this distinction determines both whether it will work and whether insurance will authorize it.
The treatment
Botox acts at the nerve ending. It cleaves SNAP-25, a protein the nerve terminal requires in order to release its chemical signals. In migraine this blocks release of pain-transmitting neuropeptides, CGRP, substance P, and glutamate, from sensory nerve endings in the scalp, forehead, and neck, and reduces the surface expression of pain-sensing receptors. Less signal traffic arriving at the brainstem means less ongoing sensitization of the central pain pathway. Botox is not a painkiller, a muscle relaxant, or a sedative. It quiets the nerve endings that keep the migraine system inflamed.
Our approach
We use the FDA-approved PREEMPT protocol: 155 units divided across 31 fixed injection sites in seven muscle groups, the forehead, brow, temples, back of the head, upper neck, and shoulders. Injections are small-volume and given with a very fine needle. Where a patient has a consistent, predictable pain location, we may add up to 40 additional units using a follow-the-pain strategy. Treatment repeats every 12 weeks.
Before your procedure
- No medication holds, fasting, or driver are needed for this visit.
- Keep taking your preventive and rescue medications as prescribed unless told otherwise.
- Bring your headache diary. Headache days are how we measure response, and how insurance authorizes continued coverage.
- Ice may be applied before or after the injections to reduce discomfort and bruising.
Procedure day
- 31 small injections; the entire visit takes about 15 minutes.
- Performed in the office. No sedation, no IV, and no imaging required.
- A very fine needle is used; most patients describe a brief pinch or sting.
- You may drive yourself home and return to work the same day.
- Ice may be applied before or after to reduce discomfort and bruising.
Benefits
- Fewer headache days per month, with benefit that accumulates across cycles.
- Reduced headache severity and shorter attacks.
- Reduced need for rescue medication, lowering the risk of medication-overuse headache.
- No daily pill, no sedation, and no drug interactions.
Recovery
- Return to normal activity immediately.
- Onset is gradual: 2 to 3 weeks, peaking near 6 weeks.
- Effect fades by weeks 10 to 12; treatment repeats at 12-week intervals.
- Two full cycles are needed before judging whether Botox works for you.
Afterward: what to expect
Distant spread: FDA boxed warning
Botulinum toxin can rarely spread beyond the injection site and produce difficulty swallowing or breathing. This has been reported hours to weeks after injection and can be life-threatening. Seek emergency care immediately if it occurs; do not wait for our office to open. Risk is higher in patients with myasthenia gravis, Lambert-Eaton syndrome, or ALS.
- Onset. Do not expect relief in the first week. Improvement typically begins at 2 to 3 weeks and peaks near 6 weeks.
- Cumulative benefit. Response commonly improves from the first cycle to the second. Two cycles are required before a fair assessment.
- Neck soreness. Temporary neck stiffness or a heavy-feeling head is common in the first 1 to 2 weeks as the neck muscles soften.
- Continue your medications. Keep taking preventives and using rescue medication as prescribed unless told otherwise.
- Headache diary. Track your headache days. This is how we measure response, and how insurance authorizes continued coverage.
Activity
Injection site care
Your procedure in one paragraph
You received 155 units of onabotulinumtoxinA distributed across 31 sites in the forehead, brow, temples, occiput, cervical paraspinal muscles, and trapezius, following the PREEMPT protocol. The medication acts locally at nerve endings in these regions to reduce release of pain-signaling neuropeptides. The effect is not immediate.
Follow-up schedule
- 1
12 weeks
Next treatment cycle and response assessment. Injections are not repeated sooner; shorter intervals increase the risk of antibody formation and permanent loss of response. Bring your completed headache diary to every visit.
Call us right away if you notice
- Difficulty swallowing, choking, or a change in your voice
- Generalized muscle weakness, or weakness away from the injection sites
- Difficulty breathing or shortness of breath
- Drooping eyelid or double vision
- Fever, spreading redness, or drainage at an injection site
This guide is the same information as the printed handout from Abilene Pain. It is general information and does not replace the instructions your care team gives you at your visit. Your care team: Nicolas Pugh, MD · Adrianne Anders, NP · Ted Chaka, PA.