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Anti-IL-5 monoclonal antibody Pregnancy: The data on pregnancy exposure from the clinical trials are insufficient to inform on drug-associated risk. Monoclonal antibodies such as reslizumab are transported across the placenta in a linear fashion as pregnancy progresses, so potential effects on a fetus are likely to be greater during the second and third trimester; reslizumab also has a long half-life, which should be taken into consideration. In animal reproduction studies there was no evidence of embryo-fetal adverse developmental effects in mice and rabbits at exposures up to approximately 6-fold and 17-fold the maximum recommended human dose respectively. In women with poorly or moderately controlled asthma the label notes an increased maternal risk of preeclampsia (§8.1, US labelling).

Reslizumab

Brand names: Cinqaero

Reslizumab is a humanised anti-interleukin-5 (IL-5) monoclonal antibody given by intravenous infusion, used as add-on therapy for severe eosinophilic asthma.

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: 3 mg/kg
Route: Intravenous infusion only, over 20 to 50 minutes. Do NOT administer as an intravenous push or bolus.
Frequency: Once every 4 weeks
SOURCE: openFDA / DailyMed US prescribing information, productName 'CINQAIR' (Teva Respiratory, LLC, label date 2020-02-29, https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=a509df2c-67b6-40c3-8b6d-f9de54b62c8a), §2.1. VERBATIM: 'The recommended dosage regimen is 3 mg/kg once every 4 weeks administered by intravenous infusion over 20-50 minutes.' NO UK SPC (eMC) RECORD WAS RETRIEVED IN THIS BUNDLE — this is US labelling and must be verified against UK labelling before publishing. ADMINISTRATION SETTING: 'CINQAIR should be administered by a healthcare professional prepared to manage anaphylaxis.' Observe the patient over the infusion and for an appropriate period following it. Discontinue the infusion immediately if the patient experiences a severe systemic reaction, including anaphylaxis. PREPARATION: supplied as 100 mg/10 mL (10 mg/mL) solution in single-use vials. Withdraw the volume based on the weight-based dose, discard any unused portion, and dispense the syringe contents slowly into an infusion bag containing 50 mL of 0.9% Sodium Chloride Injection to minimise foaming; gently invert to mix, do not shake. Do not mix or dilute with other drugs and do not infuse concomitantly in the same intravenous line with other agents. Administer immediately after preparation; if not used immediately, store the diluted solution at 2-8 degrees C or at room temperature up to 25 degrees C, protected from light, for up to 16 hours (time between preparation and administration must not exceed 16 hours). Use an infusion set with an in-line low protein-binding filter (0.2 micron pore size). Infusion time may vary depending on the total volume to be infused as based upon patient weight. Flush the intravenous administration set with 0.9% Sodium Chloride Injection on completion. PAEDIATRIC: 'CINQAIR is not indicated for use in pediatric patients less than 18 years of age. The safety and effectiveness in pediatric patients (aged 17 years and younger) have not been established' — hence paedDose is null despite the adult dose being weight-based. In two 52-week exacerbation studies the asthma exacerbation rate was HIGHER in adolescent patients treated with CINQAIR than placebo. GERIATRIC: no adjustment of dosage in geriatric patients is necessary. OTHER WARNINGS (§5): do not discontinue systemic or inhaled corticosteroids abruptly on initiation — decrease gradually if appropriate; treat pre-existing helminth infections before therapy, and if a patient becomes infected during treatment and does not respond to anti-helminth treatment, discontinue until the parasitic infection resolves. SECTION COVERAGE: the §6.1 adverse reactions table, §5 warnings and §8.1 pregnancy were truncated at the source-fetch limit, so the side-effect list below is incomplete. No renal dose adjustment statement appears in the fetched sections.

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 hypersensitivity to reslizumab or any of its excipients (§4)

Side effects

  • Oropharyngeal pain — the most common adverse reaction (incidence greater than or equal to 2%)
  • Anaphylaxis — reported in 0.3% of asthma patients in placebo-controlled studies, occurring during or within 20 minutes of completing the infusion and reported as early as the second dose; manifestations included dyspnoea, decreased oxygen saturation, wheezing, vomiting, and skin and mucosal involvement including urticaria
  • Malignancy — malignancies were observed in clinical studies (§5.3)

Interactions

  • No formal clinical drug interaction studies have been performed with CINQAIR (§7)

Clinical monograph

How it works

It binds circulating IL-5 and blocks its interaction with the eosinophil surface receptor, reducing eosinophil maturation and survival and thereby eosinophilic airway inflammation.

Prescribing in practice

  • Anaphylaxis can occur during or shortly after infusion, so doses are administered under supervision with the ability to manage severe reactions and patients are observed afterwards.
  • It is an add-on preventer for severe eosinophilic asthma and is not for acute exacerbations; usual therapy must continue.
  • Treat any pre-existing helminth infection before starting and initiate within specialist severe-asthma services per NICE guidance.

Monitoring

Monitor asthma control, exacerbation frequency and blood eosinophil count, and observe patients during and after each infusion for hypersensitivity.

Counselling the patient

  • This infusion is given to prevent attacks and is not a rescue treatment.
  • Continue your usual inhalers and reliever between infusions.
  • Report any rash, flushing, swelling or breathing difficulty during or after the infusion.

Evidence & guidelines

NICE technology appraisal guidance supports reslizumab as add-on therapy for severe eosinophilic asthma in defined populations.

Reference: NICE TA479; BTS/SIGN; 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.