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Anti-Amyloid Immunotherapy (IgG1 — Targets Pyroglutamate-Modified Amyloid-β) Pregnancy: There are no adequate data on use in pregnant women to evaluate for a drug-associated risk of major birth defects, miscarriage or other adverse maternal or fetal outcomes, and no animal studies have been conducted to assess potential reproductive or developmental toxicity (US label section 8.1).

Donanemab (Anti-Amyloid Monoclonal Antibody)

Brand names: Kisunla

Donanemab is an anti-amyloid monoclonal antibody used in early symptomatic Alzheimer's disease to slow clinical progression by reducing cerebral amyloid plaque.

Auto-extracted from the source labelling — not yet independently clinician-verified. These values were distilled from the UK SPC (or the US label where noted) but have not had a clinician sign-off. Confirm against the current SmPC before prescribing.

Adult dose

Dose: Escalating dose (Dosing Regimen 2): infusion 1 - 350 mg; infusion 2 - 700 mg; infusion 3 - 1,050 mg; infusion 4 and beyond - 1,400 mg
Route: Intravenous infusion over approximately 30 minutes. Must be diluted with 0.9% sodium chloride injection only, to a final concentration of 4 mg/mL to 10 mg/mL, before administration
Frequency: Every 4 weeks
NO UK SPC WAS AVAILABLE IN THIS BUNDLE - the dose above is taken from the US prescribing information for KISUNLA (donanemab-azbt, Eli Lilly, label date 2025-12-30) and must be verified against UK labelling/MHRA and NICE positioning before publication. PATIENT SELECTION: confirm the presence of amyloid beta pathology prior to initiating treatment. STOPPING: consider stopping dosing based on reduction of amyloid plaques to minimal levels on amyloid PET imaging - in the pivotal studies dosing was stopped based on a reduction of amyloid levels below predefined thresholds on PET. MISSED INFUSION: resume administration every 4 weeks at the same dose as soon as possible. MRI MONITORING FOR ARIA: obtain a recent baseline brain MRI prior to initiating treatment, and obtain an MRI prior to the 2nd, 3rd, 4th and 7th infusions; if a patient experiences symptoms suggestive of amyloid related imaging abnormalities (ARIA), perform clinical evaluation including MRI if indicated. DOSING INTERRUPTION FOR ARIA-E: asymptomatic patients with mild ARIA-E on MRI may continue at the current dose and schedule, but suspend dosing for moderate or severe ARIA-E on MRI; patients with mild clinical symptoms may continue based on clinical judgement if MRI severity is mild, and dosing should be suspended for moderate or severe clinical symptoms - suspend until MRI demonstrates radiographic resolution and symptoms resolve, with a follow-up MRI 2 to 4 months after initial identification considered, and resumption guided by clinical judgement. DOSING INTERRUPTION FOR ARIA-H: asymptomatic patients with mild ARIA-H may continue at the current dose and schedule, and dosing should be suspended for moderate or severe ARIA-H and for any symptomatic ARIA-H, until MRI demonstrates radiographic stabilisation and symptoms resolve; for severe ARIA-H, use clinical judgement when considering whether to continue or permanently discontinue. In patients who develop intracerebral haemorrhage greater than 1 cm in diameter during treatment, suspend dosing until MRI demonstrates radiographic stabilisation and symptoms resolve, then use clinical judgement on continuing or permanently discontinuing. PREPARATION: allow the vial to equilibrate to room temperature, inspect visually for particulate matter and discoloration (the solution is clear to opalescent, colourless to slightly yellow to slightly brown), use aseptic technique, and use only 0.9% sodium chloride injection for dilution. PRESENTATION: 350 mg/20 mL (17.5 mg/mL) single-dose vial. GERIATRIC USE (the relevant population): in Study 1 ages ranged from 59 to 86 years (mean 73; 90% aged 65 and over, 41% aged 75 and over) and in Study 2 from 59 to 85 years (mean 74; 93% aged 65 and over, 55% aged 75 and over); no overall differences in safety or effectiveness were observed between patients 65 years of age and older and younger adult patients. No age-based dose adjustment is stated. PAEDIATRIC: safety and effectiveness in paediatric patients have not been established - no paediatric dose is stated.

Dose auto-extracted from US FDA prescribing information (openFDA / DailyMed) — cross-check; US labelling may differ from UK — not yet clinician-verified. Always confirm against the product SmPC and your local formulary before prescribing.

Contraindications

  • Known serious hypersensitivity to donanemab-azbt or to any of the excipients - reactions have included anaphylaxis

Side effects

  • ARIA-E (amyloid related imaging abnormalities with oedema) - most common adverse reaction, at least 10% and higher incidence than placebo
  • ARIA-H microhaemorrhage - most common adverse reaction, at least 10% and higher incidence than placebo
  • ARIA-H superficial siderosis - most common adverse reaction, at least 10% and higher incidence than placebo
  • Headache - most common adverse reaction, at least 10% and higher incidence than placebo
  • Infusion-related reactions - the infusion rate may be reduced or the infusion discontinued, and pre-treatment with antihistamines, paracetamol/acetaminophen or corticosteroids may be considered prior to subsequent dosing
  • Hypersensitivity reactions including anaphylaxis

Clinical monograph

How it works

It is a monoclonal antibody that binds to deposited amyloid-beta plaque and promotes its clearance, lowering the cerebral amyloid burden.

Prescribing in practice

  • Amyloid-related imaging abnormalities (ARIA), comprising cerebral oedema and microhaemorrhage, are the key risk and require baseline and scheduled MRI surveillance, with caution in carriers of the ApoE e4 genotype.
  • Confirmation of amyloid pathology and exclusion of contraindications such as significant prior haemorrhage are needed before starting, with treatment given by infusion under specialist supervision.
  • Concurrent antithrombotic or anticoagulant therapy may increase the risk of haemorrhagic complications and should be carefully assessed.

Monitoring

Regular MRI monitoring for ARIA, alongside review for infusion reactions and cognitive response, is integral to treatment.

Counselling the patient

  • You will need regular brain scans to check for swelling or small bleeds.
  • Report any new headache, confusion, dizziness or visual changes promptly.
  • Treatment aims to slow progression rather than reverse the condition.

Evidence & guidelines

Phase 3 trial evidence shows donanemab reduces amyloid plaque and modestly slows clinical decline in early Alzheimer's disease.

Reference: Sims et al. NEJM 2023 (TRAILBLAZER-ALZ 2); FDA Prescribing Information Kisunla 2024; Alzheimer's Association 2024 guidelines; 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.