Some guidelines say paracetamol is only suitable for osteoarthritis, not rheumatoid arthritis (RA), as it is a poor anti-inflammatory. However, further reading online indicates that paracetamol is still used for other inflammatory rheumatological disorders like gout and RA. May I seek further clarification on this point?
Paracetamol (acetaminophen) is no longer recommended as a first-line for the pain associated with osteoarthritis (OA) as it has only small, non-clinically significant effects on the pain and there are safety concerns over long-term use for osteoarthritis (e.g., Macahdo et al., 2015; Roberts et al., 2016). Previously, paracetamol alone was used for the pain associated with OA if there was no significant inflammation following the damage to the joints. However, paracetamol is rarely sufficient for the pain associated with gout or RA. As there is always inflammation in gout and RA, a drug that is both analgesic and anti-inflammatory, such as a non-steroidal anti-inflammatory drug (NSAID), is usually preferable. So you will typically find paracetamol in evidence-based medicine guidelines for OA but not for RA or gout.
However, paracetamol will still cause analgesia. Therefore, you will still find it used sometimes as a safer option in cases when the pain is mild or as an addon between doses of ibuprofen (which happens to have a similar dosing interval) to provide additional analgesia. In addition, for patients for whom NSAIDs are contraindicated, you will often find paracetamol used.
References:
Machado GC, Maher CG, Ferreira PH, Pinheiro MB, Lin CW, Day RO, McLachlan AJ, Ferreira ML. Efficacy and safety of paracetamol for spinal pain and osteoarthritis: systematic review and meta-analysis of randomised placebo controlled trials. BMJ. 2015;350:h1225.
Roberts E, Delgado Nunes V, Buckner S, Latchem S, Constanti M, Miller P, Doherty M, Zhang W, Birrell F, Porcheret M, Dziedzic K, Bernstein I, Wise E, Conaghan PG. Paracetamol: not as safe as we thought? A systematic literature review of observational studies. Ann Rheum Dis. 2016;75(3):552.
