Muscle Spasm

3 medicines

A muscle spasm is a sudden, involuntary muscle contraction causing pain and restricted movement, usually settling with rest or short courses of muscle relaxants.

Flexeril

Cyclobenzaprine

15mg

Flexeril is a painkillers medication containing Cyclobenzaprine, available as 15mg tablets.

from $1.56 / tablet View

Robaxin

Methocarbamol

500mg

Robaxin is a painkillers medication containing Methocarbamol, available as 500mg tablets.

from $0.85 / tablet View

Skelaxin

Metaxalone

400mg

Skelaxin is a painkillers medication containing Metaxalone, available as 400mg tablets.

from $1.70 / tablet View

Key facts

  • A muscle spasm is a sudden, involuntary contraction that can strike any skeletal muscle, tightening the area and resisting movement for seconds to several minutes.
  • Overexertion, dehydration, sitting for long periods, poor posture, nerve compression, and electrolyte imbalance are the most common triggers. Back, neck, and leg muscles are affected most often.
  • Most episodes settle with rest, gentle stretching, heat, and fluids. When spasms are severe or persistent, muscle relaxants such as methocarbamol, metaxalone, and cyclobenzaprine are the standard medical approach, usually for short courses alongside physiotherapy.
  • Seek medical assessment promptly if spasms come with significant weakness, loss of bladder or bowel control, or follow a fall or spinal injury.

What triggers a spasm

Overexertion and dehydration are the two most frequent causes. Sitting for long periods strains the lower back and neck, and acute injury, poor posture, nerve compression, and electrolyte imbalance can all trigger the same response. Back, neck, and leg muscles are the most common sites, and episodes can arrive without warning during ordinary activity.

Relaxing the muscle

Most episodes settle with rest, gentle stretching, heat applied to the area, and adequate fluid intake. When spasms are severe or persist despite self-care, muscle relaxants are the standard medical approach. Agents such as methocarbamol, metaxalone, and cyclobenzaprine work centrally to reduce the muscle's firing rate and ease pain. They are typically used for short courses alongside physiotherapy rather than as a standalone long-term solution. Browse the full painkillers range for related options.

When to see a doctor

If spasms are accompanied by significant weakness, loss of bladder or bowel control, or follow a fall or injury to the spine, seek medical assessment promptly. These can signal a more serious underlying problem rather than a simple muscular episode.

This page is educational and does not replace advice from a doctor or pharmacist who knows your health history.