For back spasms, NSAIDs like ibuprofen or naproxen are the most effective over-the-counter option, and they’re often the first medication recommended in clinical guidelines. But medication is only one piece. A combination of ice or heat, gentle movement, and short-term use of a muscle relaxant (if needed) typically resolves most back spasms within a few days to a few weeks.
Over-the-Counter Pain Relievers
You have two main OTC categories: acetaminophen (Tylenol) and NSAIDs like ibuprofen (Advil, Motrin) or naproxen (Aleve). NSAIDs are the stronger choice for back pain because they reduce both pain and the inflammation that often accompanies a spasm. A research review in BMJ actually found no evidence that acetaminophen alone relieved back pain, reduced disability, or improved quality of life compared to a placebo.
That said, you don’t have to pick one or the other. Acetaminophen and NSAIDs work through different pathways, so taking both at the same time can provide additive pain relief without compounding side effects. If you go that route, keep acetaminophen under 3,000 mg per day to protect your liver, and follow the dosing instructions on your NSAID of choice. Clinical guidelines suggest a two-to-four-week course of NSAIDs at anti-inflammatory doses for acute back pain when needed.
Prescription Muscle Relaxants
If OTC options aren’t enough, a doctor may prescribe a skeletal muscle relaxant. These medications work by calming activity in your brain and spinal cord, which reduces the signals telling your muscles to clench. They don’t act directly on the muscle itself in most cases.
Muscle relaxants are effective for spasm-related pain, but they come with significant drowsiness. For that reason, they’re often prescribed to be taken at bedtime only, sometimes alongside an NSAID during the day. They’re meant for short-term use, generally a few weeks at most. Older adults should use them with extra caution because the sedation increases fall risk.
One important safety note: muscle relaxants should never be mixed with alcohol. Both are central nervous system depressants, meaning they slow your breathing, heart rate, and reflexes. Combining them can cause dangerously slowed breathing, severe dizziness, loss of coordination, and in serious cases, overdose. The same risk applies if you’re taking opioid pain relievers, benzodiazepines (like Xanax), or certain antidepressants.
Ice, Heat, and Other Non-Drug Approaches
Current clinical guidelines actually recommend trying non-drug treatments first, since most acute back spasms improve on their own regardless of treatment. The strongest evidence supports superficial heat, with moderate evidence also behind massage, acupuncture, and spinal manipulation.
The timing of ice versus heat matters. For the first 72 hours after a spasm starts, ice is the better choice because it reduces swelling and inflammation. Apply it for 10 to 15 minutes at a time, with at least two hours between applications. After that initial three-day window, switch to heat if you’re still in pain. Heat promotes blood flow, loosens tight muscles, and supports flexibility. Apply heat for 15 to 20 minutes per session. A heating pad, warm towel, or hot bath all work.
Gentle movement is also important. While resting feels instinctive during a spasm, prolonged bed rest can actually slow recovery. Light walking or easy stretching, as tolerated, helps keep the muscles from stiffening further.
Topical Treatments
Topical patches and gels can provide localized relief without the systemic side effects of oral medications. Lidocaine patches numb the area by blocking pain signals at the skin and superficial muscle level. OTC versions contain 4% lidocaine and can stay on for up to eight hours. Prescription-strength patches (5% lidocaine) last 12 hours but require a 12-hour break before reapplication.
Menthol-based creams and gels (like Biofreeze or Icy Hot) create a cooling sensation that distracts from pain. These won’t treat the underlying spasm, but they can make the pain more manageable, especially when layered with other approaches.
Magnesium for Muscle Relaxation
Magnesium plays a direct role in how muscles contract and relax. It acts as a natural muscle relaxant and vasodilator, and low magnesium levels are associated with increased muscle cramping and spasm. Many people don’t get enough magnesium from diet alone, so supplementation is worth considering.
There’s no single established dose for back spasms specifically. The optimal amount depends on your current magnesium levels, overall health, and the form you choose. Magnesium glycinate is a popular option because it’s well absorbed and gentler on the stomach than other forms. If you’re dealing with recurring spasms, it may be worth having your magnesium levels checked.
How Long Back Spasms Last
If the spasm is from simple overuse, you might feel better in a couple of days. If there’s an underlying muscle strain, recovery can take several weeks. Most people with acute back spasms improve significantly within two to four weeks regardless of which treatment they choose.
Some situations require immediate attention. Call 911 if the pain is so severe you can’t move, or if you also have chest pain. See a doctor right away if you notice loss of bladder or bowel control, muscle weakness in your arms or legs, numbness or odd sensations on one side of your body, or loss of balance and coordination. These symptoms can signal nerve compression or spinal cord involvement, which needs urgent evaluation.