Muscle Relaxers for Spinal Disc Pain:
Side Effects

What you will learn in this article:

- Muscle Relaxers Overview: These medications, primarily used to alleviate muscle spasms and pain, come with both mild and severe side effects, making it essential to understand their implications.

- Common Side Effects: While drowsiness, dizziness, and dry mouth are frequently observed, understanding the reasons behind these effects can help in managing them better.

- Severe Reactions: Though rare, muscle relaxers can lead to serious reactions like difficulty breathing or severe rashes; immediate medical attention is crucial in such cases.

- Informed Usage: Before opting for muscle relaxers, weighing their benefits against potential side effects and consulting with healthcare professionals ensures safer and more effective pain management.

Muscle relaxers, commonly prescribed to alleviate muscle spasms and pain, have become a mainstay in the management of various musculoskeletal conditions.

While their efficacy in providing relief is undeniable, it's crucial for patients and caregivers to be well-versed with their potential side effects.

This article delves deep into the spectrum of side effects associated with muscle relaxers, from the commonly observed mild reactions to the rarer, more severe ones.

Furthermore, we'll explore the underlying causes of these side effects, offer strategies for their management, and emphasize the importance of making informed decisions when considering muscle relaxer therapy.

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Muscle Relaxers Side Effects

Muscle relaxers, whether used short-term or as part of a longer therapeutic regimen, work by depressing the central nervous system, leading to decreased tension and pain in the muscles.

While their benefits in providing relief from discomfort and improving mobility are significant, it's equally vital to recognize that they come with a range of side effects.

A comprehensive understanding of these side effects not only ensures safer use but also empowers patients to make informed decisions about their health.

Recognizing the potential reactions and being prepared can significantly enhance the therapeutic experience, ensuring that the benefits of the medication are reaped without undue risk.

Common and Mild Side Effects of Muscle Relaxers

Muscle relaxers, while effective in alleviating muscle tension and pain, can manifest a range of side effects.

Among the most frequently observed are:

Drowsiness or Fatigue: Many individuals taking muscle relaxers report feeling unusually tired or drowsy.

This is because these medications often depress the central nervous system, leading to a general feeling of sleepiness.

Dizziness: A sensation of lightheadedness or feeling as if one might faint is another common side effect.

This can be attributed to the drug's impact on the central nervous system, which can sometimes affect balance and spatial orientation.

Dry Mouth: Some users might experience a parched or sticky feeling in the mouth.

This is due to the anticholinergic effects of certain muscle relaxers, which reduce saliva production.

Constipation: Reduced bowel movements or difficulty in passing stools can be a consequence of muscle relaxer use.

The slowing down of the digestive tract, again due to the anticholinergic properties of some of these drugs, is the primary reason behind this.

Blurred Vision: Certain muscle relaxers can affect the eye's ability to focus, leading to temporary blurred vision.

This is often a result of the medication's impact on the muscles that control the eye's lens.

Headache: Some individuals might experience headaches, which can range from mild to moderate in intensity.

This can be due to the changes in blood pressure or tension caused by the medication.

The reasons for these side effects often stem from the drug's primary mechanism of action.

Muscle relaxers work by depressing or slowing down the central nervous system's activities.

While this leads to relaxation of the muscles, it can also affect other systems in the body, leading to the side effects mentioned.

Additionally, individual reactions to medications can vary, meaning that while one person might experience a particular side effect, another might not.

It's essential to be aware of these potential reactions and consult with a healthcare professional if any side effect becomes bothersome or persistent.

The following is a more thorough list of the possible side effects that can occur for each of the individual muscle relaxers that may be prescribed.

Everyone is different and you may experience a side effect that is not on the list. If you are experiencing a new symptom while taking any of these medications, you should bring that to your doctor’s attention as well.

Allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat

Seizure (convulsions)

Confusion, hallucinations

An uneven heartbeat

Drowsiness, dizziness, weakness, tired feeling


Sleep problems (insomnia)

Nausea, constipation

Urinating more often than usual

Allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat

Seizure (convulsions)

Confusion, hallucinations

Drowsiness, dizziness, weakness, tired feeling


Sleep problems (insomnia)

Paralysis (loss of feeling)

Extreme weakness or lack of coordination

Feeling light–headed, fainting

Fast heartbeat

Vision loss


Depression, feeling irritable

Blurred vision

Nausea, vomiting, hiccups, upset stomach

Allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat

Seizure (convulsions)

Confusion, hallucinations

An uneven heartbeat

Drowsiness, dizziness, weakness, tired feeling

Extreme weakness or lack of coordination

Feeling light–headed, fainting

Fast heartbeat

Blurred vision

Chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, general ill feeling

Sudden numbness or weakness, especially on one side of the body

Sudden headache, confusion, problems with vision, speech, or balance

Nausea, stomach pain, low fever, loss of appetite, dark urine, clay–colored stools, jaundice (yellowing of the skin or eyes)

Unusual thoughts or behavior

Easy bruising or bleeding, unusual weakness

Dry mouth or throat

Loss of appetite, stomach pain, nausea

Diarrhea, constipation, gas

Muscle weakness

Allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat

Confusion, hallucinations

Drowsiness, dizziness, weakness, tired feeling

Feeling light–headed, fainting

Nausea, stomach pain, low fever, loss of appetite, dark urine, clay–colored stools, jaundice (yellowing of the skin or eyes)

Unusual thoughts or behavior

Dry mouth or throat

Loss of appetite, stomach pain, nausea

Diarrhea, constipation, gas

Muscle weakness

Slow heart rate

Burning or pain when you urinate

Feeling anxious or nervous

Numbness or tingling


Back pain

Increased muscle tone or spasms

Sweating or skin rash 

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Rare but Severe Reactions

While muscle relaxers are generally considered safe when taken as prescribed, there are instances where individuals might experience less common but more severe side effects.

These reactions, although infrequent, can have significant implications and require immediate medical attention.

Allergic Reactions: Some individuals might be allergic to specific components in muscle relaxers.

Symptoms can range from skin rashes, itching, and hives to more severe reactions like difficulty breathing, swelling of the face, lips, tongue, or throat.

An allergic reaction can progress to anaphylaxis, a life-threatening condition that requires urgent medical intervention.

Heart Palpitations or Irregular Heartbeat: Certain muscle relaxers can affect the heart's rhythm, leading to palpitations or an irregular heartbeat.

This can be particularly concerning for individuals with pre-existing heart conditions.

Severe Gastrointestinal Issues: While mild constipation or dry mouth might be common, some users might experience severe stomach pain, nausea, vomiting, or even bloody stools.

These symptoms can indicate a more serious underlying issue, such as gastrointestinal bleeding.

Mental or Mood Changes: Some individuals might experience severe mood swings, confusion, agitation, or even hallucinations.

These symptoms can be particularly distressing and might indicate that the medication is affecting the brain in unexpected ways.

Difficulty Urinating: An inability to urinate or extreme pain during urination can be a sign of urinary retention, a condition where the bladder doesn't empty completely.

This can be a direct result of the muscle relaxer's impact on the muscles controlling the bladder.

Respiratory Depression: In rare cases, especially when combined with other central nervous system depressants like alcohol or opioids, muscle relaxers can lead to respiratory depression.

This is a condition where breathing becomes dangerously slow or even stops, and it can be life-threatening.

These severe reactions underscore the importance of using muscle relaxers under the guidance of a healthcare professional.

If any of these symptoms are observed, it's crucial to seek medical attention immediately.

While muscle relaxers can offer relief from muscle pain and spasms, being aware of their potential risks ensures that they're used safely and effectively.

Underlying Causes of Side Effects

Muscle relaxers, as their name suggests, are primarily designed to relax tense muscles and alleviate muscle spasms.

But how exactly do they achieve this, and why might they lead to side effects?

Delving into the mechanism of action of these drugs can shed light on these questions.

Mechanism of Action: Most muscle relaxers work by acting on the central nervous system rather than directly on the muscles.

They depress the central nervous system, leading to sedation and a reduction in muscle tone.

This central action is why many of the side effects of muscle relaxers, such as drowsiness or dizziness, are similar to those of other central nervous system depressants like alcohol.

Some muscle relaxers might also interfere with the transmission of signals in the spinal cord or brain, which can further contribute to their side effect profile.

Factors Increasing the Risk: Several factors can amplify the risk of experiencing side effects from muscle relaxers:

Dosage: Higher doses can lead to more pronounced side effects. It's always crucial to adhere to the recommended dosage and not self-medicate.

Individual Sensitivity: Everyone's body is different. Some individuals might be more sensitive to muscle relaxers and experience side effects even at lower doses.

Age: Older adults might metabolize drugs differently and are often more susceptible to side effects like dizziness or confusion.

Concurrent Medications: Taking muscle relaxers alongside other medications, especially other central nervous system depressants, can amplify side effects. This is why it's essential to inform healthcare providers about all medications being taken.

Alcohol Consumption: Alcohol is also a central nervous system depressant. Combining it with muscle relaxers can intensify side effects and even lead to dangerous respiratory depression.

Understanding the underlying causes of side effects and the factors that increase their risk can empower individuals to use muscle relaxers more safely.

It's always essential to be informed and to communicate openly with healthcare professionals about any concerns or observed side effects.

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Managing and Mitigating Side Effects

Tips and Strategies to Reduce the Risk of Side Effects:

Start Low and Go Slow: If you're new to a muscle relaxer, it's often best to start with the lowest recommended dose. This allows your body to adjust, and you can monitor for any adverse reactions.

Avoid Alcohol: As mentioned earlier, alcohol can amplify the sedative effects of muscle relaxers. It's best to avoid alcohol while on these medications.

Stay Hydrated: Some muscle relaxers can cause dry mouth or dehydration. Drinking plenty of water can help counteract this.

Avoid Operating Heavy Machinery: Due to the drowsiness some muscle relaxers can induce, it's recommended to avoid driving or operating heavy machinery until you know how the medication affects you.

Follow a Regular Sleep Schedule: Some side effects, like drowsiness or insomnia, can be managed by maintaining a regular sleep schedule and ensuring you get adequate rest.

When to Consult a Doctor and What to Expect:

Severe Reactions: If you experience severe side effects like difficulty breathing, swelling of the face or throat, or a severe rash, seek medical attention immediately. These could be signs of a serious allergic reaction.

Persistent or Worsening Side Effects: If side effects persist or become more severe over time, it's essential to consult with your doctor. They might adjust the dosage or recommend a different medication.

Regular Check-ups: Especially if you're on long-term muscle relaxer therapy, regular check-ups can help monitor for any potential side effects or complications.

During these visits, your doctor will likely ask about any new or worsening symptoms and might conduct tests to ensure the medication isn't affecting your liver or other organs.

Open Communication: Always be open with your healthcare provider about any concerns or side effects you're experiencing. They're there to help and can offer guidance on managing side effects or adjusting treatment as needed.

By being proactive and informed, you can maximize the benefits of muscle relaxers while minimizing potential side effects.

Always prioritize your health and well-being, and don't hesitate to seek professional advice when in doubt.

Making Informed Decisions

Muscle relaxers, like any medication, present a balance between potential benefits and risks.

When considering the use of these drugs, it's essential to make informed decisions that prioritize both health and quality of life.

Weighing the Benefits Against Potential Side Effects:

Benefits: Muscle relaxers can provide significant relief from muscle spasms, pain, and discomfort.

For many, they can be the difference between a day filled with pain and a more comfortable, productive day.

Potential Side Effects: As discussed, these medications come with a range of side effects, from mild drowsiness to more severe reactions.

It's crucial to weigh the relief they provide against the potential for these side effects.

For some, the benefits might outweigh the risks, while for others, alternative treatments might be more appropriate.

Personal Factors: Each individual's health profile, including other medications they might be taking, existing health conditions, and even lifestyle factors like work demands or daily routines, can influence this balance.

It's essential to consider all these elements when deciding on muscle relaxer therapy.

Importance of Patient Education and Communication:

Staying Informed: Before starting any medication, arm yourself with knowledge.

Understand the potential side effects, interactions with other drugs, and any lifestyle changes you might need to make.

This knowledge will empower you to make decisions that are right for your unique situation.

Open Dialogue with Healthcare Professionals: Always maintain an open line of communication with your doctor or pharmacist.

They can provide valuable insights, answer questions, and offer guidance tailored to your specific needs.

If you're experiencing side effects or have concerns about the medication, don't hesitate to reach out.

Stay Updated: Medical advice and recommendations can evolve. Regular check-ups and staying updated on the latest research or guidelines related to muscle relaxers can help ensure you're always making the most informed decisions about your health.

In the realm of healthcare, knowledge truly is power. By understanding the intricacies of muscle relaxers and maintaining open communication with healthcare professionals, you can navigate the path of pain management with confidence and clarity.


The drowsiness is one of the common side effects of muscle relaxers. They work by depressing the central nervous system, which can lead to feelings of sleepiness or fatigue.

While rare, some severe reactions can occur, such as difficulty breathing, rash, or swelling. If you experience any of these, it's crucial to seek medical attention immediately.

Muscle relaxers work by blocking pain sensations between the nerves and the brain or by targeting the skeletal muscles directly. This action helps reduce muscle spasms and pain.

While muscle relaxers are effective for many, alternative therapies like acupuncture, chiropractic care, and physical therapy can offer relief without the potential side effects of medications. It's all about finding what works best for you.

Before starting on muscle relaxers, consider the severity of your pain, potential side effects, interactions with other medications, and any existing health conditions. Always consult with a healthcare professional to make an informed decision.

While muscle relaxers can be effective, it's essential to explore all options. Physical therapy, lifestyle changes, and even surgical interventions might be more suitable for some individuals.


American Addiction Centers. Side Effects of Muscle Relaxers. This resource provides an in-depth look into the side effects associated with muscle relaxers, emphasizing the potential for addiction and misuse.

PainScale. Risks and Side Effects for Muscle Relaxants Used for Chronic Pain. This article delves into the specific risks and side effects of muscle relaxants, especially when used for chronic pain management.

Physio-Pedia. The Influence of Muscle Relaxers on Physiologic Processes and Exercise. This piece discusses the impact of muscle relaxers on physiological processes, particularly in relation to exercise and physical therapy.

American Family Physician. Management of Chronic Pain. This comprehensive article from the American Academy of Family Physicians provides guidelines on managing chronic pain, including the use of muscle relaxers.

Cleveland Clinic. Muscle Relaxers. A detailed overview of muscle relaxers, their uses, and potential side effects, provided by one of the leading healthcare institutions.

National Center for Biotechnology Information. Muscle Relaxants in Pain Management. This scientific article from the NCBI offers a deep dive into the role of muscle relaxants in pain management, discussing their efficacy and potential risks. PDF Link

Dr. Ron Daulton, Jr.

About the Author

Dr. Ron Daulton, Jr., an acclaimed chiropractor, esteemed educator, and inspiring author, has devoted his life to fostering understanding of natural healthcare and enhancing well-being across society.

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