Muscle Relaxers: Uses, Side Effects, Risks, and Treatment Options

Muscle relaxers are prescription medications used to reduce muscle spasms, stiffness, and pain. Some work by slowing activity in the central nervous system, while others act more directly on muscles. These medications can be helpful when used as prescribed, but they may also cause drowsiness, dizziness, interactions, misuse, or dependence concerns in some situations.

Key Takeaways

• Muscle relaxers are often prescribed for short-term muscle spasms, pain, or stiffness.
• Many muscle relaxers can cause drowsiness, dizziness, slowed thinking, or impaired coordination.
• Mixing muscle relaxers with alcohol, opioids, benzodiazepines, or sleep medications can increase safety risks.
• Carisoprodol carries a higher misuse and dependence risk than many other muscle relaxers.
• If muscle relaxer use feels difficult to control, treatment and support can help.

What Are Muscle Relaxers?

Muscle relaxers, also called muscle relaxants, are medications used to treat muscle spasms, tightness, or pain. They may be prescribed after an injury, during a painful flare-up, or for certain neurological conditions that cause muscle stiffness. Most prescription muscle relaxers do not heal the underlying cause of pain. Instead, they may reduce spasms or calm nerve signaling long enough for rest, physical therapy, stretching, or other treatments to work. Some muscle relaxers are used for short-term musculoskeletal pain, while others may be used for longer-term spasticity related to conditions such as multiple sclerosis, spinal cord injury, or neurological disease. The right medication depends on the cause of your symptoms, your health history, and other medications you take.

Common Types of Muscle Relaxers

Muscle relaxers are not all the same. Some are mainly used for acute pain or spasms, while others are used for spasticity.

This table is a general overview, not a substitute for medical advice. Your provider can help determine if a muscle relaxer is appropriate and which option is safest for your situation.

How Muscle Relaxers Work

Many muscle relaxers work by affecting the brain and spinal cord rather than the muscle itself. These medications may slow nerve signals that contribute to spasms, pain, or muscle tightness. Because they affect the central nervous system, they can also affect alertness, coordination, and reaction time.[1] This is why drowsiness is such a common concern. Even if a muscle relaxer helps with pain, it may make driving, working, making decisions, or caring for others more difficult. Other medications, such as dantrolene, work differently by acting more directly on muscle contraction. These differences matter because side effects, misuse risks, and drug interactions can vary widely from one medication to another.

Common Muscle Relaxer Side Effects

Side effects depend on the specific medication, dose, and your personal health history. However, several effects are common across many muscle relaxers. Common side effects may include:

• Drowsiness: You may feel unusually sleepy, slowed down, or less alert during the day.
• Dizziness: You may feel lightheaded, unsteady, or more likely to fall.
• Dry Mouth: Some muscle relaxers can reduce saliva and cause mouth discomfort.
• Fatigue: You may feel physically tired or mentally foggy.
• Nausea or Upset Stomach: Some medications may cause digestive discomfort.
• Blurred Vision: Your vision may feel temporarily unfocused or strained.

Cyclobenzaprine and methocarbamol both list drowsiness and dizziness among common side effects, which is why caution is important when starting either medication.[2],[3] If side effects interfere with your daily life, talk with a healthcare provider before changing your dose or stopping the medication.

Risks of Mixing Muscle Relaxers With Other Substances

Muscle relaxers can become more dangerous when combined with other substances that slow the central nervous system. This includes alcohol, opioids, benzodiazepines, sleep medications, and some other sedating prescriptions. Mixing muscle relaxers with other depressants may increase the risk of:

• Extreme Sedation: You may become too sleepy to stay awake or respond normally.
• Slowed Breathing: Breathing may become shallow, slow, or unsafe.
• Poor Coordination: The risk of falls, injuries, or accidents may increase.
• Confusion: You may have trouble thinking clearly or remembering what happened.
• Overdose: Combining depressants can increase overdose risk, especially at higher doses.

Central nervous system depressants are one of the major prescription drug classes that may be misused, and some muscle relaxers share sedating effects with that broader category.⁶ If you are prescribed a muscle relaxer, ask your provider or pharmacist what substances to avoid.

Can Muscle Relaxers Be Misused or Addictive?

Some muscle relaxers have more misuse potential than others. Carisoprodol is the clearest example, as it has been associated with abuse, dependence, withdrawal, misuse, and criminal diversion.⁵ Signs of muscle relaxer dependency may include:

• Taking Higher Doses: Using more than prescribed to increase sedation or relaxation.
• Using Someone Else's Medication: Taking a muscle relaxer without medical guidance.
• Mixing With Alcohol or Other Drugs: Combining substances to intensify effects.
• Using for Nonmedical Effects: Taking medication to feel high, numb, or disconnected.

If your use of muscle relaxers starts feeling hard to control, it may be time to seek professional support.

Muscle Relaxer Dependence and Withdrawal

Dependence happens when your body adapts to a medication and reacts when the medication is reduced or stopped. Dependence is not the same thing as addiction, but it can make stopping more difficult. Carisoprodol has documented withdrawal concerns, especially after prolonged use. Withdrawal symptoms have been reported after abrupt discontinuation, so the medication should generally be limited to short-term use for acute musculoskeletal discomfort.⁵ Possible withdrawal concerns may include:

• Insomnia: You may have trouble sleeping after stopping.
• Anxiety or Restlessness: You may feel unusually tense or agitated.
• Tremors or Shakiness: Your body may feel physically unsettled.
• Nausea or Vomiting: Some people experience stomach symptoms.
• Return of Pain or Spasms: Original symptoms may return or feel more intense.

Do not stop a muscle relaxer suddenly if you have been taking it regularly, especially at high doses or for longer than prescribed.

When to Seek Help for Muscle Relaxer Use

It can be hard to know when medication use has crossed a line, especially if the medication was originally prescribed for a real medical concern. A good rule of thumb is to pay attention to control, consequences, and safety.

You may benefit from addiction treatment if you notice any of the following:

• Taking More Than Prescribed: You regularly increase your dose without medical guidance.
• Running Out Early: You use the medication faster than intended.
• Mixing Substances: You combine muscle relaxers with alcohol, opioids, benzodiazepines, or sleep aids.
• Unable to Stop: You want to cut back but keep returning to use.
• Use Is Causing Problems: The use of muscle relaxers is affecting your health, relationships, work, or responsibilities.

Treatment Options for Muscle Relaxer Misuse

Treatment depends on the medication, how long you have used it, whether other substances are involved, and whether you have withdrawal risks.

Treatment may include:⁷

• Medical Evaluation: A provider can assess medication use, side effects, interactions, and withdrawal risk.
• Supervised Tapering: Gradual dose reduction may help reduce withdrawal symptoms for some medications.
• Medical Detox: If multiple substances are involved or withdrawal may be risky, detox may be recommended.
• Inpatient Rehab: Residential care can provide structure and 24/7 support.
• Outpatient Treatment: Outpatient programs let you attend care while living at home.
• Behavioral Therapy: Therapy can help you build coping skills, manage triggers, and prevent relapse.
• Pain Management Support: Safer pain strategies may reduce reliance on sedating medications.

If muscle relaxer use is connected to chronic pain, anxiety, sleep problems, or another substance, treatment should address the full picture instead of focusing only on the medication.

Taking the Next Step Safely

Prescription muscle relaxers can be useful, but they are not risk-free. While they are effective for treating muscle spasms, pain, and other health conditions, muscle relaxers are currently one of the most commonly abused prescription medications. When someone suddenly stops taking prescription muscle relaxers, this can lead to withdrawal symptoms that range from mild to severe. Misuse or abuse of these medications can also lead to muscle relaxant overdose.