Over-the-counter (OTC) medicines like painkillers, cold remedies and antacids are easy to buy without a prescription – but “no prescription” does not mean “no risk.” Taking too much paracetamol, mixing medicines, or self-treating for too long can cause real harm. As a rule, do not take any OTC medicine for more than 3-5 days for a new symptom without checking with a doctor or pharmacist. This guide explains the common risks and when to ask first.
Last updated: 16 June 2026. Reviewed for medical accuracy by the Even team.
Key takeaways
- OTC does not mean risk-free – dosage, duration and interactions all matter.
- Adults should not exceed about 4,000 mg (4 g) of paracetamol in 24 hours; overdose can cause liver failure.
- Many cold and flu combos already contain paracetamol – doubling up is a common, dangerous mistake.
- NSAIDs (ibuprofen, etc.) can irritate the stomach and affect the kidneys, especially with long use.
- See a doctor if symptoms last beyond 3-5 days, worsen, or you take other regular medicines.
Why “over-the-counter” still needs care
OTC medicines are sold without a prescription because they are generally safe at recommended doses. The risks come from how they are used: taking more than the label says, combining products with the same active ingredient, using them for too long, or mixing them with prescription drugs or alcohol. Self-diagnosis can also mask a condition that needs proper treatment.
Common OTC risks at a glance
| Medicine | Main risk | Watch out for |
|---|---|---|
| Paracetamol (acetaminophen) | Liver damage in overdose | Max ~4 g/day; hidden in cold combos |
| NSAIDs (ibuprofen, etc.) | Stomach ulcers, kidney strain | Avoid long use; take with food |
| Antibiotics (not truly OTC) | Antibiotic resistance | Never self-prescribe; finish only as directed |
| Antacids | Mask serious causes | Persistent acidity needs a check-up |
| Cough/cold combos | Doubling ingredients | Read every active ingredient |
When to talk to a doctor or pharmacist first
- You take regular prescription medicines (interaction risk).
- You are pregnant, breastfeeding, or buying for a child.
- Symptoms last more than 3-5 days or keep coming back.
- You have liver, kidney, heart or stomach conditions.
- You are unsure of the cause – for example a persistent cough, cold or fever.
Frequently Asked Questions
Yes, at recommended doses for short periods. Risks come from taking too much, combining products with the same ingredient, long-term use, or mixing with prescription drugs or alcohol.
Most adults should not exceed about 4,000 mg (4 g) in 24 hours. Overdose can cause serious liver damage, and many cold combos already contain paracetamol.
As a rule, no more than 3 to 5 days for a new symptom. If it lasts longer, worsens, or keeps returning, see a doctor or pharmacist.
Because of dosage limits, drug interactions and hidden ingredients – and because self-treating can mask a condition that needs proper care. This matters most if you take other medicines or have a health condition.
They can sometimes be used together under guidance, but doubling up on the same ingredient or exceeding doses is dangerous. Check with a pharmacist or doctor first.
Antibiotics should not be self-prescribed. Misuse drives antibiotic resistance, so they should only be taken when prescribed and exactly as directed.
The bottom line
OTC medicines are convenient and safe when used correctly – but read labels, respect dose limits, avoid doubling up, and don’t self-treat for too long. When in doubt, a quick word with a pharmacist or doctor prevents harm. Explore more in our Health section.
A quick consult is easy when it’s covered: see health insurance with OPD cover, and doctor consultations at Even Hospital in Bangalore.
Related reading
- Cough, cold and fever: when to see a doctor
- Diabetes: types, symptoms and management
- Annual health check-ups
- More from the Even Health blog
References
- U.S. FDA – safe use of over-the-counter medicines and acetaminophen limits.
- NHS – taking painkillers safely (paracetamol and NSAIDs).
- World Health Organization (WHO) – antimicrobial resistance.
