A headache after Dysport typically develops within the first 24 hours and resolves within one to two days. In some cases it can linger a few days longer, but a post-Dysport headache that stretches beyond a week is uncommon and worth mentioning to your provider.
How Common Dysport Headaches Are
Headache is one of the more frequently reported side effects of Dysport, but the numbers depend on what it’s being used for. In clinical trials for cosmetic treatment of frown lines (glabellar lines), about 9% of people who received Dysport reported a headache, compared to 5% who got a placebo injection. For cervical dystonia, the rate was 11% with Dysport versus 9% with placebo. When used for muscle spasticity in the arms or legs, headache rates were lower, generally between 1% and 3%.
The gap between the Dysport group and the placebo group is worth noting. Some of these headaches would have happened regardless of the injection. The act of getting poked with a needle, tensing your face or neck, or simply being anxious about a procedure can trigger a headache on its own. Still, Dysport does appear to cause headaches at a modestly higher rate than a sham injection.
When the Headache Starts and How It Feels
Most people notice the headache within the first 24 hours after treatment. It tends to feel like a mild to moderate tension headache, often centered around the forehead or the injection area. According to the FDA prescribing information for Dysport, most non-injection-site side effects become noticeable about one week after treatment and can last several weeks. Headache, however, tends to follow a faster timeline, showing up sooner and clearing sooner than effects like muscle weakness or fatigue.
The headache is generally dull rather than throbbing. If you’ve had cosmetic Dysport in the forehead area, you may feel tightness or pressure around the brow as the product starts to take effect. This sensation is distinct from the headache itself but can overlap with it, making the first day or two feel uncomfortable.
What Helps Relieve It
Over-the-counter pain relievers like acetaminophen (Tylenol) or ibuprofen (Advil) are the standard approach for a mild post-injection headache. A few other things that can help:
- Stay hydrated. Dehydration is a common headache trigger and can compound the post-treatment discomfort.
- Apply a cold compress. A cool cloth on the forehead can ease tension-type pain without interfering with the Dysport.
- Rest in a quiet room. Bright lights and screen time can make any headache feel worse.
- Avoid alcohol for the first day. Alcohol dilates blood vessels and can worsen headache symptoms.
If headaches happen every time you get Dysport, your provider may suggest lowering the dose at your next session. Smaller doses sometimes produce the same cosmetic result with fewer side effects. Switching to a different botulinum toxin product is another option some people explore if headaches are persistent and bothersome.
When a Post-Dysport Headache Is a Concern
A mild headache that fades within a couple of days is not a red flag. But certain symptoms alongside a headache warrant a call to your provider right away. Eye pain, light sensitivity, or changes in vision after a Dysport injection near the eyes could signal a problem beyond a routine headache. Swelling of the face, hands, or mouth, difficulty breathing or swallowing, rash, or fever can indicate a serious allergic reaction.
The effects of botulinum toxin products can, in rare cases, spread beyond the injection site. This can happen hours to weeks after treatment. If you develop muscle weakness in areas that weren’t injected, trouble swallowing, difficulty speaking, or a headache that keeps getting worse rather than improving, those are signs that need prompt medical evaluation. These complications are uncommon, but they’re the reason your provider reviews warning signs with you before treatment.
Why Dysport Causes Headaches
The exact mechanism isn’t fully understood. One theory is that the tiny needle punctures themselves trigger localized inflammation, which can radiate as a headache. Another possibility is that as Dysport begins relaxing the targeted muscles, the surrounding muscles compensate by tensing, creating a tension-type headache pattern. The forehead and brow area are especially prone to this because those muscles are involved in so many unconscious expressions throughout the day.
There’s also some research looking at whether Dysport might actually cause fewer headache-related side effects than other botulinum toxin products. MedStar Health has been studying Dysport for migraine treatment, partly to see whether it produces less neck pain and muscle discomfort than alternatives. That research is still ongoing, but it suggests the headache profile may vary between different formulations.