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PARP inhibitor Pregnancy: Rubraca should not be used during pregnancy unless the clinical condition of the woman requires treatment with rucaparib. There are no or limited data in pregnant women; animal studies have shown reproductive toxicity and rucaparib may cause fetal harm. A pregnancy test before initiating treatment is recommended in women of reproductive potential, and effective contraception should be used during treatment and for 6 months following the last dose. Breast-feeding is contraindicated during treatment and for 2 weeks after the final dose.

Rucaparib (Specialist drug)

Brand names: Rubraca

Rucaparib is an oral PARP inhibitor used as a specialist treatment in ovarian cancer, particularly in BRCA-mutated disease and as maintenance therapy.

Adult dose

Dose: 600 mg twice daily (equivalent to a total daily dose of 1,200 mg)
Route: Oral — with or without food; doses taken approximately 12 hours apart
Frequency: Twice daily
Treatment should be initiated and supervised by a physician experienced in the use of anticancer medicinal products. Patients should start maintenance treatment no later than 8 weeks after completion of their final dose of the platinum-containing regimen. Duration: first-line maintenance treatment of advanced ovarian cancer — continue until disease progression, unacceptable toxicity or completion of 2 years treatment; maintenance treatment of platinum-sensitive relapsed ovarian cancer — continue until disease progression or unacceptable toxicity. If a patient vomits after taking a dose, do not retake it — take the next scheduled dose. If a dose is missed, resume with the next scheduled dose. Dose reduction levels: starting dose 600 mg twice daily (two 300 mg tablets twice daily); first reduction 500 mg twice daily (two 250 mg tablets); second reduction 400 mg twice daily (two 200 mg tablets); third reduction 300 mg twice daily (one 300 mg tablet). Manage moderate to severe (CTCAE Grade 3 or 4) reactions such as neutropenia, anaemia and thrombocytopenia by dose interruption and/or reduction. Grade 3 AST/ALT elevation without other signs of liver dysfunction: monitor LFTs weekly until resolution to Grade <=2 and continue rucaparib provided bilirubin is < ULN and alkaline phosphatase is < 3 x ULN; interrupt if AST/ALT do not decline within 2 weeks until Grade <=2, then resume at the same or a reduced dose. Grade 4 AST/ALT elevation: interrupt until values return to Grade <=2, then resume with a dose reduction and monitor LFTs weekly for 3 weeks. Complete blood count testing before starting treatment and monthly thereafter is advised. Elderly: no starting dose adjustment for patients >= 65 years; limited clinical data in patients aged 75 or over. Hepatic impairment: no starting dose adjustment in mild or moderate impairment (monitor moderate impairment carefully); not recommended in severe hepatic impairment (total bilirubin > 3 x ULN) — no clinical data. Paediatric: safety and efficacy in children or adolescents aged less than 18 years have not been established; no data are available. Note: eMC section 4.5 (interactions) was not present in the fetched bundle, so no interaction list is given here — clinician to source.

Dose adjustments

Renal

No starting dose adjustment is required in patients with mild or moderate renal impairment. There are no clinical data in patients with severe renal impairment (CLcr less than 30 mL/min), therefore rucaparib is not recommended for use in severe renal impairment and may only be used if the potential benefit outweighs the risk. Patients with moderate or severe renal impairment should be carefully monitored for renal function and adverse reactions.

Dose independently re-sourced from UK Summary of Product Characteristics (SPC) via the eMC; US FDA prescribing information (openFDA / DailyMed) — cross-check; US labelling may differ from UK — clinician-reviewed. Always confirm against the product SmPC and your local formulary before prescribing.

Contraindications

  • Hypersensitivity to the active substance or to any of the excipients
  • Breast-feeding

Side effects

  • Nausea and vomiting
  • Fatigue/asthenia
  • Anaemia (>= Grade 3 in 25%)
  • ALT and AST elevations
  • Neutropenia and thrombocytopenia
  • Also very common: abdominal pain, dysgeusia, decreased appetite, diarrhoea, dyspepsia, dizziness, dyspnoea, increased blood creatinine, hypercholesterolaemia, leukopenia. Myelodysplastic syndrome/acute myeloid leukaemia is a common adverse reaction

Clinical monograph

How it works

It inhibits poly(ADP-ribose) polymerase enzymes, impairing single-strand DNA break repair so that tumour cells deficient in homologous recombination accumulate lethal DNA damage (synthetic lethality).

Prescribing in practice

  • Rare but serious myelodysplastic syndrome and acute myeloid leukaemia have been reported, so persistent or unexplained cytopenias must be investigated.
  • Myelosuppression is common and full blood count should be monitored regularly.
  • It is teratogenic and effective contraception is required during and after treatment.

Monitoring

Monitor full blood count regularly and investigate any prolonged haematological abnormality.

Counselling the patient

  • Report unusual tiredness, bruising, bleeding or recurrent infections.
  • Use reliable contraception during and after treatment as advised.
  • Keep all blood test appointments.

Evidence & guidelines

Use is supported by NICE guidance and pivotal trials including the ARIEL programme in ovarian cancer.

Reference: NICE TA611/TA784; SmPC; Drug verified in RxNorm (NLM); confirm dosing against the manufacturer SPC (eMC). Verify against your local formulary and current prescribing references before prescribing. The structured dose values shown have been reviewed by a clinician. Monograph status: clinician-reviewed (2026-07-04).

Related

Curated clinical cross-links plus same-class fallbacks.