Acetaminophen (Tylenol) is the only over-the-counter pain reliever widely recommended during pregnancy. It remains the first-line choice in all three trimesters, endorsed by the American College of Obstetricians and Gynecologists as the safest analgesic and fever reducer for pregnant women. Beyond acetaminophen, your options narrow considerably, and timing matters: some medications are relatively low-risk early in pregnancy but dangerous later on.
Acetaminophen: The Go-To Option
Acetaminophen works for headaches, muscle aches, joint pain, and fevers. The standard guidance is to use the lowest effective dose for the shortest time you need it. For most adults, the maximum daily limit is 3,000 to 4,000 mg, but staying well below that ceiling is the goal during pregnancy.
You may have seen headlines linking acetaminophen to autism or ADHD in children. In September 2025, the FDA initiated a label change suggesting a possible association. However, ACOG reviewed the evidence and reaffirmed that no causal link has been established. The strongest, most methodologically rigorous studies show no evidence that acetaminophen causes neurodevelopmental disorders. The concern appears strongest with chronic, heavy use throughout pregnancy rather than occasional use for a headache or fever. Untreated high fevers carry their own risks to a developing baby, so avoiding acetaminophen entirely when you actually need it isn’t necessarily safer.
Why NSAIDs Are Restricted
Ibuprofen (Advil, Motrin), naproxen (Aleve), and other nonsteroidal anti-inflammatory drugs are commonly used outside of pregnancy, but the FDA warns against taking them at 20 weeks of gestation or later. After that point, NSAIDs can impair the baby’s kidney function. Since the baby’s kidneys produce most of the amniotic fluid in the second half of pregnancy, this can lead to dangerously low fluid levels. Low amniotic fluid affects lung development, muscle formation, and can cause limb problems.
Before 20 weeks, occasional NSAID use is considered lower risk, and some providers allow short courses in the first trimester for specific situations. But because acetaminophen is available and safer across all trimesters, most practitioners steer patients away from NSAIDs entirely.
Aspirin: Only at Low Doses, Only if Prescribed
Full-strength aspirin (325 mg or higher) for pain relief falls under the same NSAID warnings and is not recommended during pregnancy. Low-dose aspirin (81 mg per day) is a different story, but it’s not used for pain. The U.S. Preventive Services Task Force recommends it specifically for pregnant women at high risk of preeclampsia, started after 12 weeks and typically before 20 weeks. The FDA carved out an explicit exception for this use. If your provider hasn’t prescribed low-dose aspirin for preeclampsia prevention, there’s no reason to take it.
Opioids and Stronger Prescriptions
Opioid pain medications are sometimes prescribed for severe acute pain during pregnancy, such as after a procedure or injury, but they carry significant risks. Opioid use disorder during pregnancy is linked to preterm birth, poor fetal growth, stillbirth, specific birth defects, and maternal death. Even when used as prescribed, opioids taken regularly can cause neonatal abstinence syndrome, where the newborn goes through withdrawal after birth. Symptoms include tremors, irritability, feeding difficulties, and sometimes seizures.
Not every baby exposed to opioids develops withdrawal symptoms, and short-term use for acute pain is different from chronic use. Opioids given only at the time of delivery, for instance, do not cause neonatal withdrawal. But the long-term developmental effects of prenatal opioid exposure are still not well understood, so these medications are reserved for situations where the pain is severe enough that the benefit clearly outweighs the risk.
Muscle Relaxants
Clinical data on muscle relaxants like cyclobenzaprine (Flexeril) during pregnancy is limited, which itself is a reason for caution. A large study from the National Birth Defects Prevention Study found elevated rates of several birth defects, including cleft palate, heart defects, and other structural abnormalities, among women who used cyclobenzaprine around conception. The numbers were small and the researchers noted the estimates were imprecise, but the pattern of increased risk across multiple defect types is enough that most providers avoid prescribing muscle relaxants during pregnancy when alternatives exist.
Managing Migraines
Migraines are common during pregnancy, and losing access to your usual medications can be frustrating. Acetaminophen is the first option, though it may not be strong enough for severe episodes. Triptans, particularly sumatriptan, have been studied in pregnancy registries covering nearly 600 exposed women. The rate of major birth defects among first-trimester exposures was about 4.6%, and no distinctive pattern of defects emerged. That rate is close to the general population baseline of 3 to 5%, which provides some reassurance, though the sample size is too small to detect anything but very large increases in risk. Some providers will consider sumatriptan for debilitating migraines when other approaches have failed, weighing the severity of the migraine against the limited but imperfect safety data.
Topical Pain Relievers
Topical options like lidocaine patches or menthol-based creams are appealing because they target pain locally rather than circulating through your entire bloodstream. In practice, systemic absorption from topical products applied to intact skin is minimal. However, there are no human studies confirming their safety in pregnancy. Animal studies with lidocaine at high doses showed no harm to offspring, but the gap in human data means these products land in a gray zone. Applying a menthol cream to a sore back is likely very different from covering large or broken skin areas, where absorption increases substantially. If you’re using topical products, keep the application area small and avoid open wounds.
Non-Drug Approaches That Help
Given the limitations on medication, non-drug strategies become especially valuable during pregnancy. Several have genuine evidence behind them, not just for labor pain but for the musculoskeletal aches that come with carrying extra weight in new places for nine months.
- Physical therapy and movement: Staying mobile, using proper posture, and working with a physical therapist can reduce back and pelvic pain. Upright positions and regular gentle movement consistently reduce pain in studies.
- Massage: Effective at reducing pain intensity, especially when combined with oils. It won’t change the underlying cause, but it provides real relief.
- Acupressure and acupuncture: Both show evidence of pain reduction and improved satisfaction. Acupressure ranked among the top non-drug methods for lowering pain intensity in a systematic review.
- TENS units: Transcutaneous electrical nerve stimulation delivers mild electrical pulses through pads on the skin. It significantly reduces pain intensity, though the overall evidence quality is still considered low. Many women find it helpful for back pain.
- Heat and cold therapy: A warm (not hot) compress on sore muscles or a cold pack on an inflamed joint is simple, free, and carries no fetal risk.
How Drug Labels Work Now
If you look up a medication and see references to “Category B” or “Category C” pregnancy ratings, that system is outdated. The FDA replaced those letter categories in 2015 with the Pregnancy and Lactation Labeling Rule, which requires drug labels to include a detailed risk summary, clinical considerations, and whatever human or animal data exists. This means you won’t find a simple letter grade anymore. Instead, labels describe what’s actually known, which is more useful but also more complex. Your pharmacist can walk you through the pregnancy section of any drug label if you want specifics on a particular medication.