A muscle relaxer is not a standard treatment for a sprained ankle, and it’s unlikely to address the core problem. Ankle sprains are ligament injuries, not muscle injuries, so the medications most commonly recommended are anti-inflammatory painkillers like ibuprofen or naproxen. That said, there are limited circumstances where a muscle relaxer might play a small supporting role, particularly if muscle spasms around the ankle are part of your symptom picture.
Why Muscle Relaxers Don’t Target the Injury
When you sprain your ankle, you stretch or tear one or more ligaments, the tough bands of tissue that connect bones to each other and stabilize the joint. Muscle relaxers were designed for a different problem. They work by reducing muscle contractions, either by acting on the brain and spinal cord or directly on muscle fibers. The most commonly prescribed ones (cyclobenzaprine, carisoprodol, methocarbamol) have fair evidence of effectiveness for conditions like acute back pain and neck pain, where tight, spasming muscles are the primary source of discomfort. A torn ankle ligament doesn’t respond to that mechanism.
The swelling, pain, and instability you feel after a sprain come from damaged connective tissue and the inflammatory response your body mounts to begin healing. A muscle relaxer won’t reduce that swelling or help the ligament repair itself.
The One Scenario Where It Might Help Slightly
After an ankle sprain, the muscles surrounding the joint often tighten up involuntarily in a protective response called “muscle guarding.” This reflexive tightening is your body’s way of splinting the injured area, but it can add stiffness and make the ankle harder to examine or move. Clinical references on ankle sprains note that acute pain and muscle guarding can limit the accuracy of physical exams performed shortly after injury.
In theory, a muscle relaxer could ease this guarding. One review of skeletal muscle relaxants in musculoskeletal injuries found “fair evidence” that they can be effective for soft tissue injuries including ligament sprains, but only as a short-term option when muscle spasm is part of the symptom picture. The recommendation came with a clear caveat: if the response is weak, the injury needs to be re-evaluated and possibly diagnosed more specifically. In other words, a muscle relaxer is not a go-to treatment for sprains. It’s a secondary option that some practitioners consider briefly if spasming is making your pain worse.
What Actually Works for a Sprained Ankle
Anti-inflammatory medications have the strongest evidence for treating ankle sprains. A systematic review of clinical trials found that both oral and topical NSAIDs (like ibuprofen or naproxen, applied as a gel or taken by mouth) outperformed placebo for pain with weight bearing, pain at rest, and swelling reduction in both the short and intermediate term. A separate review of clinical practice guidelines found that four major guidelines agreed: short-term NSAID use in the acute phase of an ankle sprain is highly recommended and considered safe. Long-term use, however, is not advised.
Beyond medication, six interventions have strong enough evidence to be considered standard care for ankle sprains:
- Cryotherapy: icing the ankle to control swelling, especially in the first 48 to 72 hours
- Functional supports: braces, wraps, or taping to stabilize the joint while it heals
- Early ambulation: beginning to walk on the ankle as tolerated, rather than immobilizing it completely
- Manual therapy: hands-on techniques from a physical therapist to restore range of motion
- Rehabilitation exercises: strengthening and balance work to prevent re-injury
- Short-term NSAIDs: for pain and inflammation control
Side Effects That Could Make Recovery Harder
One practical concern with muscle relaxers after a sprain is that their most common side effects, drowsiness, fatigue, dizziness, and trouble with balance, are the opposite of what you need while recovering from an unstable ankle. The Mayo Clinic lists muscle relaxants as a medication class that increases fall risk specifically because of their sedative effects. If you’re already limping, favoring one leg, or using crutches, adding a drug that impairs your coordination and balance raises the chance of a fall or re-injury. This tradeoff rarely makes sense for a sprained ankle when safer, more targeted options exist.
How Long Ankle Sprains Take to Heal
Recovery time depends on the severity of the injury, graded on a three-point scale. A Grade 1 sprain (stretched but intact ligaments) typically allows you to bear weight immediately and heals in one to three weeks. A Grade 2 sprain (partially torn ligament) makes weight bearing painful and takes three to six weeks. A Grade 3 sprain (complete tear) makes walking on the ankle very difficult and can take several months to fully recover. Rest is generally advised for at least 24 hours after the injury, but gentle exercises can often begin soon after that.
No medication, muscle relaxer or otherwise, speeds up the biological process of ligament healing. The goal of any drug in this context is managing pain and swelling well enough that you can participate in the rehabilitation that actually drives recovery.
When to Get an X-Ray First
Before focusing on pain management, it’s worth ruling out a fracture. The Ottawa Ankle Rules are a widely validated screening tool that identifies when an X-ray is needed. You should get imaging if you have bone tenderness along the back edge of either ankle bone (the bony bumps on each side), tenderness at the tip of either ankle bone, or if you were unable to bear weight for four steps either immediately after the injury or when you sought care. These rules are highly sensitive for fractures, meaning they catch nearly all of them, so if none of these criteria apply, a fracture is very unlikely and you can focus on treating the sprain.