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Anti-CD20 monoclonal antibody Pregnancy: There are no data on the developmental risk associated with use in pregnant women, and data from case reports of pregnancies during clinical trials are insufficient to identify a drug-associated risk. Monoclonal antibodies can be actively transported across the placenta and ublituximab may cause immunosuppression in the in-utero exposed infant. Females of reproductive potential should be advised of the potential risk to a fetus and to use effective contraception during treatment and for at least 6 months after stopping. A pregnancy exposure registry monitors outcomes (1-877-411-4546).

Ublituximab

Brand names: Briumvi

Ublituximab is an anti-CD20 monoclonal antibody given by intravenous infusion as a disease-modifying treatment for relapsing forms of multiple sclerosis.

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: First infusion: 150 mg by intravenous infusion. Second infusion: 450 mg by intravenous infusion administered two weeks after the first infusion. Subsequent infusions: 450 mg by intravenous infusion administered 24 weeks after the first infusion and every 24 weeks thereafter
Route: Intravenous infusion — must be diluted in 250 mL of 0.9% Sodium Chloride Injection, USP prior to administration; give under the close supervision of an experienced healthcare professional with access to appropriate medical support to manage severe reactions
Frequency: First infusion, second infusion two weeks later, then every 24 weeks. Infusions must be separated by at least 5 months
Infusion rates (exact, per Table 1): First infusion 150 mg (6 mL) in 250 mL — start at 10 mL per hour for the first 30 minutes, increase to 20 mL per hour for the next 30 minutes, increase to 35 mL per hour for the next hour, then increase to 100 mL per hour for the remaining 2 hours; total duration 4 hours. Second infusion and all subsequent infusions 450 mg (18 mL) in 250 mL — start at 100 mL per hour for the first 30 minutes, then increase to 400 mL per hour for the remaining 30 minutes; total duration 1 hour. Infusion duration may take longer if the infusion is interrupted or slowed. Premedication before every infusion: 100 mg of methylprednisolone intravenously (or an equivalent oral dosage or equivalent corticosteroid) approximately 30 minutes before each infusion, plus an antihistamine (e.g. diphenhydramine) orally or intravenously approximately 30–60 minutes before each infusion; an antipyretic (e.g. paracetamol/acetaminophen) may also be considered. Before the first dose: screen for hepatitis B virus, test quantitative serum immunoglobulins, and obtain serum aminotransferases (ALT and AST), alkaline phosphatase and bilirubin. Administer all immunizations according to guidelines at least 4 weeks before initiation for live or live-attenuated vaccines and, whenever possible, at least 2 weeks before initiation for non-live vaccines. Before every infusion determine whether there is an active infection and delay the infusion until it resolves. Observe the patient for at least one hour after completion of the first two infusions; post-infusion monitoring of subsequent infusions is at physician discretion unless an infusion reaction and/or hypersensitivity has been observed. Missed dose: administer as soon as possible, do not wait until the next scheduled infusion, and reset the schedule so the next sequential infusion is 24 weeks after the missed infusion is given. Life-threatening infusion reactions: immediately stop the infusion and permanently discontinue. Paediatric use: safety and effectiveness in paediatric patients have not been established. Source note: no UK SPC posology was available in the fetched bundle — this draft is from US labelling and must be verified against the UK SPC.

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

  • Active hepatitis B virus (HBV) infection
  • A history of life-threatening infusion reaction to ublituximab

Side effects

  • Infusion reactions (most common, incidence ≥10%)
  • Upper respiratory tract infections (most common, incidence ≥10%)
  • Serious infections, including life-threatening and fatal infections — infection was the most common cause of discontinuation (1.3%)
  • Reduction in immunoglobulins / prolonged hypogammaglobulinaemia
  • Liver injury — clinically significant liver injury has occurred

Interactions

  • Immunosuppressive or immune-modulating therapies, including immunosuppressant doses of corticosteroids — concomitant use may increase the risk of infection; consider the risk of additive immune system effects
  • When switching from therapies with immune effects, take account of the duration and mechanism of action of those therapies because of potential additive immunosuppressive effects on initiation
  • Live-attenuated or live vaccines are not recommended during treatment and after discontinuation until B-cell repletion

Clinical monograph

How it works

It binds CD20 on B lymphocytes and produces rapid B-cell depletion, largely through antibody-dependent cellular cytotoxicity, reducing the B-cell-driven inflammation that contributes to relapses and new lesions.

Prescribing in practice

  • Infusion-related reactions are common, so infusions are given with premedication and under observation, particularly with the first dose.
  • B-cell depletion increases infection risk and can cause hypogammaglobulinaemia; hepatitis B status should be checked and vaccinations brought up to date before starting.
  • Live vaccines should be avoided during treatment and the depleted period afterwards.

Monitoring

Monitor for infusion reactions during and after administration, and watch for infections and immunoglobulin levels over the course of treatment.

Counselling the patient

  • Report any fever, persistent cough or other signs of infection.
  • Tell your clinician about any planned vaccinations, as live vaccines must be avoided.

Evidence & guidelines

Its efficacy in relapsing MS, including reduced relapse rates versus an oral comparator, was shown in the ULTIMATE I and II randomised trials.

Reference: NICE TA958; 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.