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Can we take calpol 650 on antidepressants and antipsychotics

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acetaminophen AND antidepressive agents AND drug interactions

Yes, paracetamol (Calpol 650 contains paracetamol 650 mg) is generally considered one of the safer painkillers to take with antidepressants and antipsychotics. It has no clinically significant interaction with most of them.
Why it's usually fine
  • Paracetamol doesn't affect serotonin, dopamine or QT interval. It doesn't add to the sedation, anticholinergic or serotonin syndrome risks of these drugs.
  • NSAIDs such as ibuprofen and diclofenac are different. With SSRIs and SNRIs they raise the risk of GI bleeding, so paracetamol is the usual first choice.
  • The Maudsley Prescribing Guidelines even recommend paracetamol for the fever and inflammatory response that can occur in the first 4 weeks of clozapine. They advise checking a full blood count for neutropenia at the same time (The Maudsley Prescribing Guidelines in Psychiatry, 15ed, Clozapine: common adverse effects).
Situations that need more care
  • Liver problems or heavy alcohol use: Paracetamol is hepatotoxic in excess. Chronic heavy alcohol use plus paracetamol is a recognised risk factor (Sleisenger and Fordtran's Gastrointestinal and Liver Disease, Clinical Features). Some psychiatric drugs can also affect the liver, for example chlorpromazine (cholestatic type) and valproate. If you have liver disease or drink regularly, use a lower dose and check with your doctor.
  • Clozapine: If you take it, tell your doctor about any fever. Fever can be a harmless early effect, but it can also signal infection or low white cells.
  • Hidden paracetamol: Many cold, flu and combination painkillers contain paracetamol. Count them toward your daily total.
  • Low body weight, malnutrition or kidney problems: The safe daily limit may be lower.
Practical dosing for adults
  • One 650 mg tablet every 6 hours as needed is typical.
  • Do not exceed 4 g (4,000 mg) in 24 hours. Many clinicians advise staying at or under 3 g (about 4 tablets of 650 mg) for regular use.
  • Use the lowest dose that works, and for the shortest time.
If you need it daily for more than a few days, or the pain or fever keeps coming back, see your doctor. Also check with your prescriber or pharmacist if your regimen includes several medicines, or if you have liver disease.
I ran a quick check of recent systematic reviews and found nothing that changes this advice.
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