New research based on more than 211 million shopping transactions suggests that people experiencing period pain may not always be choosing the most effective over-the-counter pain relief. Paracetamol was commonly purchased alongside pads and tampons, but clinical evidence indicates that ibuprofen and other nonsteroidal anti-inflammatory drugs can be more effective for primary dysmenorrhea because they target prostaglandins involved in uterine contractions. The best option, however, depends on individual health factors.
More than 211 million transactions analyzed
The study examined 211,332,752 loyalty-card transactions from a major UK health and beauty retailer over a 10-year period, involving more than 3.4 million customers. Researchers analyzed shopping baskets containing menstrual products such as tampons and sanitary pads alongside pain-relief medicines.
The analysis found that 26.7% of customers in the dataset bought pain relief together with menstrual products. People who menstruate were also found to be four times more likely to purchase pain relief when buying menstrual products than when purchasing other items.
However, shopping data can show which medicines people buy; it cannot determine whether a particular drug was actually taken for period pain or whether it provided effective relief.
Why ibuprofen may work better
The difference between paracetamol and ibuprofen is partly related to how the drugs work.
Primary dysmenorrhea, the medical term for common menstrual cramps without another underlying pelvic condition, is strongly linked to increased production of prostaglandins. These substances contribute to stronger uterine contractions and pain.
Ibuprofen belongs to a group of medicines known as nonsteroidal anti-inflammatory drugs, or NSAIDs. These medicines reduce prostaglandin production, addressing one of the mechanisms involved in period pain.
A network meta-analysis of over-the-counter painkillers for primary dysmenorrhea found that ibuprofen ranked among the most effective options studied and concluded that it offered a favorable balance between effectiveness and safety, although researchers said more direct comparative trials were needed.
Paracetamol may still help
This does not mean that paracetamol is ineffective for everyone.
Paracetamol works through a different mechanism and may still provide pain relief, particularly for people who cannot take NSAIDs or who have specific medical reasons to avoid them.
An older clinical trial comparing ibuprofen, naproxen sodium and paracetamol found that ibuprofen significantly reduced uterine pressure and menstrual pain in the small group studied, while paracetamol did not produce the same significant effect in that experiment.
The results support the broader understanding that anti-inflammatory medicines can be particularly useful for menstrual cramps, but treatment decisions should not be based on a single study.
The timing of medication can matter
For some people, NSAIDs may work best when taken at the beginning of menstrual pain or, when cycles are predictable, around the time symptoms are expected to start.
The aim is to reduce prostaglandin production before severe cramping becomes established.
However, the appropriate medicine, timing and dose depend on the individual and the specific product being used. People should follow the instructions provided with the medicine and seek advice from a pharmacist or healthcare professional if they are unsure.
NSAIDs are not suitable for everyone
Ibuprofen may be a better option for many people with uncomplicated menstrual cramps, but it is not automatically the right choice for everyone.
NSAIDs may be unsuitable or require medical advice for people with certain conditions, including a history of stomach ulcers or gastrointestinal bleeding, kidney disease, some cardiovascular conditions or certain forms of asthma. They can also interact with other medicines.
Pregnancy status and other individual health circumstances may also affect which painkiller is appropriate.
For this reason, period pain treatment should not be reduced to the simple message that everyone should replace paracetamol with ibuprofen.
When severe period pain needs medical attention
Painkillers may help with common menstrual cramps, but severe or worsening pain should not always be assumed to be normal.
Period pain can sometimes be associated with conditions including endometriosis, adenomyosis, uterine fibroids or pelvic inflammatory disease.
People should consider seeking medical advice if pain is severe, suddenly changes, regularly prevents normal activities, becomes progressively worse or does not improve with appropriate treatment.
Why It Matters
Period pain affects a large proportion of people who menstruate, yet the new shopping-data study suggests that medicine choices may not always reflect the strongest available clinical evidence. Understanding why NSAIDs such as ibuprofen can be effective may help people make more informed decisions. At the same time, individual medical risks mean that the most effective painkiller is not necessarily the safest choice for every person.
Frequently Asked Questions
Is ibuprofen better than paracetamol for period pain?
For primary dysmenorrhea, clinical evidence generally supports NSAIDs such as ibuprofen as effective options because they reduce prostaglandin production. However, paracetamol may still be appropriate for some people, particularly when NSAIDs cannot be used.
Why does ibuprofen help menstrual cramps?
Menstrual cramps are associated with prostaglandins, which contribute to uterine contractions. Ibuprofen is an NSAID and can reduce prostaglandin production, helping to reduce pain and cramping.
Can everyone take ibuprofen for period pain?
No. Ibuprofen and other NSAIDs are not suitable for everyone and may pose risks for people with certain stomach, kidney, cardiovascular or other medical conditions. A pharmacist or healthcare professional can provide individual guidance.
When should I see a doctor about period pain?
Medical advice is recommended if menstrual pain is severe, worsening, disrupts daily life or does not improve with appropriate treatment. These symptoms can sometimes be associated with an underlying condition such as endometriosis or adenomyosis.
Sources: PLOS Digital Health, PubMed, British Journal of Obstetrics and Gynaecology
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