Skip to content
ClinCalc Pro
Menu
FLT3 / PKC Inhibitor — AML / Mastocytosis Pregnancy: Not recommended during pregnancy, or in women of childbearing potential not using contraception - midostaurin can cause foetal harm and animal studies showed foetotoxicity. Effective contraception (methods with less than 1% pregnancy rates) during treatment and for at least 4 months after stopping. Breast-feeding should be discontinued during treatment and for at least 4 months after stopping (UK SPC 4.6).

Midostaurin

Brand names: Rydapt

Midostaurin is an oral multi-targeted protein kinase inhibitor used in FLT3-mutated acute myeloid leukaemia (with chemotherapy) and in advanced systemic mastocytosis and related mast cell neoplasms.

Adult dose

Dose: AML (in combination with standard chemotherapy, after confirmation of FLT3 mutation): 50 mg twice daily, given on days 8-21 of induction and consolidation chemotherapy cycles, and then - for patients in complete response - every day as single agent maintenance therapy until relapse, for up to 12 cycles of 28 days each. Advanced systemic mastocytosis (ASM), systemic mastocytosis with associated haematological neoplasm (SM-AHN) or mast cell leukaemia (MCL): recommended starting dose 100 mg twice daily, continued as long as clinical benefit is observed or until unacceptable toxicity occurs
Route: Oral - capsules should be swallowed whole with a glass of water and should not be opened, crushed or chewed; taken with food
Frequency: Twice daily at approximately 12-hour intervals, with food
Max: 100 mg twice daily - the ASM/SM-AHN/MCL starting dose, which is the highest dose in the SPC posology; in AML the licensed dose is 50 mg twice daily and is not escalated above it
Both indications in this page's identity (AML and mastocytosis) are covered by the fetched SPC, and both are stated in the dose above with their indication named. Treatment should be initiated by a physician experienced in the use of anti-cancer therapies. Before taking midostaurin, AML patients must have confirmation of FLT3 mutation (internal tandem duplication [ITD] or tyrosine kinase domain [TKD]) using a validated test. Prophylactic antiemetics should be administered in accordance with local medical practice as per patient tolerance. In patients receiving a haematopoietic stem cell transplant, midostaurin should be discontinued 48 hours prior to the conditioning regimen. DOSE MODIFICATION IN AML: QTc >470 msec and <=500 msec - decrease to 50 mg once daily for the remainder of the cycle, resuming the initial dose in the next cycle if QTc improves to <=470 msec; QTc >500 msec - withhold or interrupt for the remainder of the cycle; Grade 3/4 pulmonary infiltrates - interrupt for the remainder of the cycle and resume at the same dose when the infiltrate resolves to Grade <=1; other Grade 3/4 non-haematological toxicity - interrupt until resolved to Grade <=2; in maintenance, Grade 4 neutropenia (ANC <0.5 x 10^9/l) - interrupt until ANC >=1.0 x 10^9/l then resume at 50 mg twice daily, and discontinue if neutropenia (ANC <1.0 x 10^9/l) persists >2 weeks and is suspected to be related to treatment. DOSE MODIFICATION IN ASM/SM-AHN/MCL: after interruption for haematological toxicity, Grade 3/4 nausea/vomiting despite optimal anti-emetics, or other Grade 3/4 non-haematological toxicity, resume at 50 mg twice daily and, if tolerated, increase to 100 mg twice daily; discontinue if the abnormality persists for >21 days and is suspected to be related to treatment. MISSED DOSE: take the next dose at the scheduled time; if vomiting occurs, do not take an additional dose but take the next scheduled dose. SPECIAL POPULATIONS: no dose adjustment for age over 65 (but in patients aged >=60 years use only in those eligible for intensive induction chemotherapy with adequate performance status and without significant comorbidities), for mild or moderate renal impairment, or for mild or moderate (Child-Pugh A or B) hepatic impairment; clinical experience in severe renal impairment is limited and there are no data in end-stage renal disease. Use is not recommended in acute promyelocytic leukaemia. PAEDIATRIC: the SPC gives no paediatric dose - it states only that 'Rydapt should not be used in combination with intensive paediatric AML combination chemotherapy regimens including anthracyclines, fludarabine and cytarabine because of the risk of prolonged haematological recovery (such as prolonged severe neutropenia and thrombocytopenia)', so no paediatric figure is stored. Some sections of the product information we used were incomplete — check the full SPC.

Dose independently re-sourced from UK Summary of Product Characteristics (SPC) via the eMC — clinician-reviewed. Always confirm against the product SmPC and your local formulary before prescribing.

Contraindications

  • Hypersensitivity to midostaurin or to any of the excipients
  • Concomitant administration of potent CYP3A4 inducers, e.g. rifampicin, St John's Wort (Hypericum perforatum), carbamazepine, enzalutamide, phenytoin

Side effects

  • Febrile neutropenia (83.4% in the AML study) - also the most frequent serious adverse reaction
  • Nausea (83.4%) and vomiting (60.7%)
  • Exfoliative dermatitis (61.6%) - the most frequent Grade 3/4 reaction leading to discontinuation
  • Headache (45.9%)
  • Petechiae (35.8%) and pyrexia (34.5%)
  • Lymphopenia and device-related infection (frequent Grade 3/4 reactions)
  • Hyperglycaemia
  • QT prolongation (more frequent than placebo during the maintenance phase)
  • Laboratory abnormalities: decreased haemoglobin, decreased absolute neutrophil count, increased ALT and AST, hypokalaemia
  • Neutropenia and infections, including severe neutropenia (ANC <0.5 x 10^9/l)
  • Cardiac dysfunction including congestive heart failure (some fatal) and transient decreases in left ventricular ejection fraction, reported in the ASM/SM-AHN/MCL studies
  • Interstitial lung disease and pneumonitis, in some cases fatal

Monitoring

  • Monitor white blood cell counts regularly, especially at treatment initiation; interrupt treatment for unexplained severe neutropenia until ANC is >=1.0 x 10^9/l, and discontinue for recurrent or prolonged severe neutropenia suspected to be treatment-related
  • Control any active serious infection before starting monotherapy, and monitor for signs and symptoms of infection including device-related infection
  • Assess left ventricular ejection fraction when clinically indicated (at baseline and during treatment) in patients at risk of cardiac dysfunction
  • Consider interval assessments of QT by ECG if given concurrently with medicinal products that can prolong the QT interval; caution in patients at risk of QTc prolongation (e.g. concomitant medicines and/or electrolyte disturbances)
  • Monitor for pulmonary symptoms indicative of interstitial lung disease or pneumonitis and discontinue if these are >=Grade 3 without an infectious aetiology
  • Pregnancy test within 7 days prior to starting treatment in sexually active women of childbearing potential

Clinical monograph

How it works

It inhibits multiple tyrosine kinases including mutant and wild-type FLT3 and KIT, blocking downstream proliferative signalling in leukaemic and neoplastic mast cells.

Prescribing in practice

  • It can prolong the QT interval, so correct electrolytes and review concomitant QT-prolonging and interacting drugs before and during treatment.
  • It is a CYP3A4 substrate, so strong inducers or inhibitors can markedly alter exposure and should be managed carefully.
  • Nausea and vomiting are common, and it is taken with food to improve tolerability.

Monitoring

Monitor the full blood count, ECG including QT interval, and for pulmonary symptoms during treatment.

Counselling the patient

  • Take the capsules with food to reduce nausea.
  • Tell your team about all other medicines, as some interact significantly.
  • Effective contraception is required during treatment.

Evidence & guidelines

Benefit in FLT3-mutated AML was shown in the RATIFY trial, supporting its use with intensive chemotherapy.

Reference: RATIFY Trial (Stone et al. NEJM 2017); NICE TA523; SPC Rydapt; 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.