Muscle relaxants are not the first-line treatment for tension headaches, but two in particular, tizanidine and cyclobenzaprine, have the strongest evidence for people with chronic or frequent episodes. Standard pain relievers like ibuprofen and acetaminophen remain the recommended starting point for occasional tension headaches. Muscle relaxants enter the picture when headaches are frequent, when over-the-counter options aren’t cutting it, or when tight muscles in the neck and shoulders are a major contributor.
Why Muscle Relaxants Aren’t First Choice
The International Headache Society does not recommend muscle relaxants for treating individual tension headache episodes. The reasoning is straightforward: for a single headache, a standard pain reliever works faster and with fewer side effects. The American Pain Society echoes this, positioning muscle relaxants as an alternative rather than a go-to option.
Where muscle relaxants become genuinely useful is in prevention. If you’re dealing with tension headaches several days a week, a daily muscle relaxant can reduce how often they occur and how intense they feel. This is a different strategy than popping a pill when a headache hits. It’s a daily regimen designed to keep the headaches from developing in the first place.
Tizanidine: The Strongest Evidence
Tizanidine has the most robust clinical data supporting its use for chronic tension headaches. In a double-blind, placebo-controlled trial of 134 patients published in the journal Headache, tizanidine reduced overall headache severity by 54% over 12 weeks, compared to just 19% for a placebo. It also outperformed placebo across every measure researchers tracked: total headache days per week, severe headache days, average intensity, peak intensity, and headache duration.
The numbers are worth looking at more closely. Patients on tizanidine saw a 55% reduction in severe headache days versus 21% for placebo. Headache duration dropped by 35% compared to 19%. Peak intensity fell by 35% versus 20%. These aren’t subtle differences.
The catch is side effects. Nearly half the patients in the trial (47%) experienced drowsiness. About a quarter reported dizziness, and a similar proportion had dry mouth. One in five felt general weakness. These side effects are common enough that dosing typically starts low (around 2 mg at bedtime) and gradually increases over several weeks, eventually reaching up to 20 mg per day split across three doses. Many people settle at a dose somewhere below the maximum based on what they can tolerate.
Cyclobenzaprine: A Common Alternative
Cyclobenzaprine is the other muscle relaxant frequently prescribed for tension headaches, particularly when muscle tightness in the neck and shoulders plays a clear role. It’s often given as a single 10 mg dose at bedtime. This timing takes advantage of its sedative effect, helping with sleep while relaxing the muscles that tighten overnight and contribute to morning headaches.
Cyclobenzaprine doesn’t have the same large-scale headache-specific trial data that tizanidine does, but it’s widely used in clinical practice for tension headaches associated with muscle spasm. Its sedation profile is similar to tizanidine’s, and the bedtime-only dosing can make the drowsiness less disruptive to daily life. Extended-release formulations are also available, starting at 15 mg once daily, which can smooth out the side effects for some people.
Metaxalone and Methocarbamol: Less Sedating Options
If drowsiness from tizanidine or cyclobenzaprine is a dealbreaker, metaxalone and methocarbamol are sometimes considered. These cause less sedation, which matters if you need to function normally during the day. The trade-off is that there’s very little clinical data specifically supporting their use for tension headaches. The American Academy of Family Physicians notes they may be useful for patients who can’t tolerate the drowsiness of the more studied options, but the evidence base is thin.
What Side Effects to Expect
All muscle relaxants used for headache share a core set of side effects. Sedation is the most common and most limiting. Tizanidine tends to cause more dry mouth than other options, while some alternatives like baclofen lean more toward muscle weakness. Dizziness is common across the category.
These medications can also interact with alcohol and other sedating drugs, compounding the drowsiness. Liver function can be affected with longer-term use of tizanidine and cyclobenzaprine, so periodic blood work is sometimes part of the monitoring plan. Older adults are more sensitive to the sedative and cognitive effects, making these medications trickier to use safely in that population.
How Muscle Relaxants Fit Into a Treatment Plan
For an occasional tension headache, ibuprofen or acetaminophen is still the better choice. They work faster, have fewer side effects for short-term use, and target the pain directly. Muscle relaxants don’t relieve a headache that’s already happening the way a pain reliever does.
Muscle relaxants make the most sense when tension headaches have become a pattern, occurring multiple times per week. In that scenario, a daily preventive approach with tizanidine or cyclobenzaprine can meaningfully reduce headache frequency and severity. Tizanidine has the edge in clinical evidence, with a clear demonstration of reducing headache days by about 30% and severe headache days by more than 50%. Cyclobenzaprine’s bedtime-only dosing makes it a practical choice when nighttime muscle tension and poor sleep are part of the problem.
Many people also benefit from combining a muscle relaxant with non-drug approaches: physical therapy for tight neck and shoulder muscles, posture correction if you work at a desk, and stress management techniques. The muscle relaxant addresses the physical tightness, but it works best when paired with strategies that tackle the underlying triggers driving that tightness in the first place.