Paracetamol: Low extent of oxidative metabolism. Inducer of CYP 3A4. Three references consider it safe. Occasional patient reports of suspected porphyrinogenicity, but vast and significant clinical experience of non-porphyrinogenicity. Codeine: Opioid substrate for CYP2D6 and 3A4. Several references consider it safe for use.
Chemical description
Paracetamol: Anilide (acetaminophen) derivative metabolized by conjugation with glucuronic acid and sulfate. A small part (<4%) is oxidatively metabolized by CYPs and excreted as cysteine and mercapto conjugates. At low concentrations inducer of CYP 3A4, increasing activity and content. Codeine: Opioide with analgetic and antitussive properties. Demetylated by CYP2D6 and 3A4. Inhibitor of 2D6.
Personal communication
Paracetamol: Thunell, patient inquiry: tolerated (n=28), possibly not tolerated (n=2).
Andersson C, patient inquiry: used without ill effects (n=18).
Used in Swedish porphyria ward.
Ipnet drug reports
Paracetamol: Uneventful use reported in 430 patients with acute porphyria. Codeine: Uneventful use reported in 27 patients with acute porphyria.
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References
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Citation details
PubMed ID
1.
Effects of antihypertensive drugs on hepatic heme biosynthesis, and evaluation of ferrochelatase inhibitors to simplify testing of drugs for heme pathway induction.
Anderson KE. Biochim Biophys Acta. 1978 Oct; 543(3):313-27.