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Bispecific DLL3 × CD3 T-cell engager Pregnancy: There are no data from the use of tarlatamab in pregnant women. It is unknown whether it is excreted in human milk; a risk to the suckling child cannot be excluded, so a decision must be made whether to discontinue breast-feeding or treatment. No fertility studies have been conducted (§4.6).

Tarlatamab (Specialist drug)

Brand names: Imdelltra

Tarlatamab is a bispecific T-cell-engaging antibody used in adults with advanced small-cell lung cancer that has progressed after prior chemotherapy.

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: Initial dose 1 mg on Day 1, followed by 10 mg on Day 8, 10 mg on Day 15 and 10 mg every 2 weeks thereafter.
Route: Intravenous infusion over 1 hour at a constant flow rate using a programmable, lockable, non-elastomeric infusion pump with an alarm. Infusion rate 250 mL/hour for a 250 mL IV preparation. Prime the line with 0.9% sodium chloride or final prepared solution, and flush the line over 3-5 minutes with 0.9% sodium chloride on completion.
Frequency: Day 1, Day 8, Day 15, then every 2 weeks. Administer until disease progression or unacceptable toxicity.
Concomitant medicines on Day 1 and Day 8: dexamethasone 8 mg intravenously (or equivalent) within 1 hour prior to the infusion, and 1 litre of normal saline intravenously immediately after completion of the infusion (per standard-of-care guidelines). Ensure patients are well hydrated before administration. Monitoring: during the infusion and for at least 16 hours after the first infusion (Day 1); 6-8 hours post infusion on Day 8; 2-4 hours post infusion at subsequent infusions at the healthcare professional's discretion. On Days 1 and 8 patients should remain within 1 hour of an appropriate healthcare setting for 24 hours from each infusion, accompanied by a caregiver, and both patient and caregiver should be informed of CRS and ICANS signs and symptoms before discharge. Restart after delay (SPC Table 6): last dose Day 1 1 mg — if 14 days or less give 10 mg and continue the planned schedule, if more than 14 days restart at 1 mg; last dose Day 8 10 mg — if 21 days or less give 10 mg, if more than 21 days restart at 1 mg; last dose Day 15 or later 10 mg — if 28 days or less give 10 mg, if more than 28 days restart at 1 mg. CRS (Table 2), ICANS (Table 3) and cytopenia/hepatic/other adverse-reaction (Table 4) dose modifications apply. Elderly: no dose adjustment necessary. Hepatic impairment: no dose adjustment in mild impairment; not studied in moderate or severe. Paediatric: safety and efficacy in children aged 18 years and under have not yet been established (§4.2). Must be initiated and supervised by physicians experienced in small cell lung cancer, and administered only by a qualified healthcare professional with support to manage severe CRS and ICANS.

Dose adjustments

Renal

Based on population pharmacokinetic analyses, no dose adjustment is required in patients with mild or moderate renal impairment; tarlatamab has not been studied in patients with severe renal impairment (§4.2).

Dose auto-extracted from UK Summary of Product Characteristics (SPC) via the eMC; 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

  • Hypersensitivity to the active substance or to any of the excipients (§4.3)

Side effects

  • Cytokine release syndrome (56.7%)
  • Decreased appetite (36.4%)
  • Pyrexia (31.9%)
  • Dysgeusia (31.3%)
  • Constipation (30.4%)
  • Anaemia (30.0%)
  • Fatigue (29.8%)

Clinical monograph

How it works

It binds DLL3 on small-cell lung cancer cells and CD3 on T cells, bringing the two together so that T cells are activated to destroy the tumour cells.

Prescribing in practice

  • Cytokine release syndrome and neurological toxicity (including ICANS) can be serious, so the first doses are given with a step-up schedule and close monitoring in an appropriate care setting.
  • Patients should be monitored for an adequate period after early doses and counselled not to drive if neurological symptoms are possible.
  • Infections, cytopenias and infusion-associated reactions can occur.

Monitoring

Monitor closely for cytokine release syndrome and neurological symptoms, especially during and after the initial step-up doses, alongside blood counts and signs of infection.

Counselling the patient

  • Seek urgent help for fever, dizziness, confusion, or new weakness or difficulty speaking.
  • Arrange to stay close to the treatment centre and avoid driving during the early monitoring period as advised.
  • Report signs of infection promptly.

Evidence & guidelines

Efficacy in previously treated small-cell lung cancer was shown in a dedicated registrational trial.

Reference: 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.