Dosage & Administration
Administration of VIMIZIM should be supervised by a healthcare provider knowledgeable in the management of hypersensitivity reactions including anaphylaxis. (
2 mg per kg body weight administered once every week as an intravenous infusion over a minimum of 3.5 to 4.5 hours, based on infusion volume. (
See the full prescribing information for administration modifications due to hypersensitivity reactions. (
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Vimizim Prescribing Information
In clinical trials with VIMIZIM, 44 of 235 (18.7%) patients experienced hypersensitivity reactions, including anaphylaxis. Hypersensitivity reactions have occurred as early as 30 minutes from the start of infusion but as late as six days after infusion. Frequent symptoms of hypersensitivity reactions (occurring in more than 2 patients) included anaphylactic reactions, urticaria, peripheral edema, cough, dyspnea, and flushing.
Consider the risks and benefits of re-administering VIMIZIM following a severe reaction.
Patients with acute febrile or respiratory illness at the time of VIMIZIM infusion may be at higher risk of life-threatening complications from hypersensitivity reactions. Careful consideration should be given to the patient's clinical status prior to administration of VIMIZIM and consider delaying the VIMIZIM infusion.
Sleep apnea is common in MPS IVA patients. Evaluation of airway patency should be considered prior to initiation of treatment with VIMIZIM. Patients using supplemental oxygen or continuous positive airway pressure (CPAP) during sleep should have these treatments readily available during infusion in the event of an acute reaction, or extreme drowsiness/sleep induced by antihistamine use.
WARNING: HYPERSENSITIVITY REACTIONS INCLUDING ANAPHYLAXIS and RISK OF ACUTE RESPIRATORY COMPLICATIONS Patients treated with enzyme replacement therapies have experienced life-threatening hypersensitivity reactions, including anaphylaxis. Anaphylaxis has occurred during the early course of enzyme replacement therapy and after extended duration of therapy. Initiate VIMIZIM in a healthcare setting with appropriate medical monitoring and support measures, including access to cardiopulmonary resuscitation equipment. If a severe hypersensitivity reaction (e.g., anaphylaxis) occurs, discontinue VIMIZIM and immediately initiate appropriate medical treatment, including use of epinephrine. Inform patients of the symptoms of life-threatening hypersensitivity reactions, including anaphylaxis and to seek immediate medical care should symptoms occur [see Warnings and Precautions (5.1)] .Patients with acute respiratory illness may be at risk of serious acute exacerbation of their respiratory compromise due to hypersensitivity reactions and require additional monitoring [see Warnings and Precautions (5.2)] .WARNING: HYPERSENSITIVITY REACTIONS INCLUDING ANAPHYLAXIS and RISK OF ACUTE RESPIRATORY COMPLICATIONS See full prescribing information for complete boxed warning .
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Dosage and Administration (Administration of VIMIZIM should be supervised by a healthcare provider knowledgeable in the management of hypersensitivity reactions including anaphylaxis. 2 mg per kg body weight administered once every week as an intravenous infusion over a minimum of 3.5 to 4.5 hours, based on infusion volume. See the full prescribing information for administration modifications due to hypersensitivity reactions.
The recommended dosage of VIMIZIM is 2 mg/kg administered intravenously over a minimum range of 3.5 to 4.5 hours (based on infusion volume) once every week. In the event of a severe hypersensitivity reaction (e.g., anaphylaxis), discontinue the VIMIZIM infusion and immediately initiate appropriate medical treatment, including use of epinephrine. In the event of a mild to moderate hypersensitivity reaction, consider slowing or temporarily interrupting the infusion, or administering additional antihistamines, antipyretics, and/or corticosteroids [see Warnings and Precautions (5.1)] .Use aseptic technique during preparation.
Use an infusion set equipped with a low-protein binding 0.2 micrometer (µm) in-line filter to administer VIMIZIM . Do not infuse with other products in the infusion tubing. Compatibility with other products has not been evaluated.
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Warnings and Precautions (Life-threatening hypersensitivity reactions, including anaphylaxis, have been reported in patients treated with enzyme replacement therapies, including VIMIZIM. In premarketing clinical trials, 18 of 235 (7.7%) patients treated with VIMIZIM experienced signs and symptoms consistent with anaphylaxis. These 18 patients experienced 26 anaphylactic reactions during infusion with signs and symptoms including cough, erythema, throat tightness, urticaria, flushing, cyanosis, hypotension, rash, dyspnea, chest discomfort, and gastrointestinal symptoms (e.g., nausea, abdominal pain, retching, and vomiting) in conjunction with urticaria. These cases of anaphylaxis occurred as early as 30 minutes from the start of infusion and up to three hours after infusion. Anaphylaxis occurred as late into treatment as the 47thinfusion. In clinical trials with VIMIZIM, 44 of 235 (18.7%) patients experienced hypersensitivity reactions, including anaphylaxis. Hypersensitivity reactions have occurred as early as 30 minutes from the start of infusion but as late as six days after infusion. Frequent symptoms of hypersensitivity reactions (occurring in more than 2 patients) included anaphylactic reactions, urticaria, peripheral edema, cough, dyspnea, and flushing. Anaphylaxis has occurred during the early course of enzyme replacement therapy and after extended duration of therapy. Administration of VIMIZIM should be supervised by a healthcare provider knowledgeable in the management of hypersensitivity reactions including anaphylaxis. Initiate VIMIZIM in a healthcare setting with appropriate medical monitoring and support measures, including access to cardiopulmonary resuscitation equipment. Observe patients closely for an appropriate period of time after administration of VIMIZIM, taking into account the time to onset of anaphylaxis seen in premarketing clinical trials. Because of the potential for hypersensitivity reactions, administer antihistamines with or without antipyretics prior to infusion. Management of hypersensitivity reactions should be based on the severity of the reaction and include slowing or temporarily interrupting the infusion, and/or administering additional antihistamines, antipyretics, and/or corticosteroids for mild to moderate reactions. If a severe hypersensitivity reaction (e.g., anaphylaxis) occurs, discontinue VIMIZIM and immediately initiate appropriate medical treatment, including use of epinephrine. Inform patients of the symptoms of life-threatening hypersensitivity reactions, including anaphylaxis and to seek immediate medical care should symptoms occur. Consider the risks and benefits of re-administering VIMIZIM following a severe reaction. | 10/2025 | |||||||||||||||||||||||||
VIMIZIM (elosulfase alfa) is indicated for patients with Mucopolysaccharidosis type IVA (MPS IVA; Morquio A syndrome).
Administration of VIMIZIM should be supervised by a healthcare provider knowledgeable in the management of hypersensitivity reactions including anaphylaxis. (
- Administration of VIMIZIM should be supervised by a healthcare provider knowledgeable in the management of hypersensitivity reactions including anaphylaxis[see Warnings and Precautions (5.1)].
- Initiate VIMIZIM in a healthcare setting with appropriate medical monitoring and support measures, including access to cardiopulmonary resuscitation[see Warnings and Precautions (5.1)].
- This product must be diluted prior to administration and administered using a low-protein binding infusion set equipped with a low-protein binding 0.2 micrometer (µm) in-line filter.
- Consider pre-medicating with antihistamines, with or without antipyretics, 30 to 60 minutes prior to the start of the infusion[see Warnings and Precautions (5.1)].
2 mg per kg body weight administered once every week as an intravenous infusion over a minimum of 3.5 to 4.5 hours, based on infusion volume. (
- Determine the number of VIMIZIM vials based on the patient's actual body weight in kg and the recommended dose[see Dosage and Administration (2.2)].
- Remove vials from the refrigerator.
- Select the appropriate size 0.9% Sodium Chloride Injection, USP infusion bag and calculate the infusion volume based on patient's actual body weight:
- For patients who weigh less than 25 kg, the final infusion volume should be 100 mL
- For patients who weigh 25 kg or more, the final infusion volume should be 250 mL.
- Withdraw and discard a volume of 0.9% Sodium Chloride Injection, USP from either the 100 mL or 250 mL infusion bag equal to the volume of VIMIZIM to be added.
- Withdraw the required volume of VIMIZIM from the vial(s) and add to the 0.9% Sodium Chloride Injection, USP infusion bag. Gently rotate the infusion bag to mix the diluted solution. Avoid vigorous shaking or agitation. Discard unused portion remaining in the vial(s).
- Visually inspect the solution for particulate matter and discoloration. The solution should be clear to slightly opalescent and colorless to pale yellow. The diluted VIMIZIM solution may contain proteinaceous particles in the form of translucent fibers which will be removed by the in-line filter during infusion. Discard if opaque particles are present or the solution is discolored.
See the full prescribing information for administration modifications due to hypersensitivity reactions. (
Injection: 5 mg/5 mL (1 mg/mL) as a clear to slightly opalescent and colorless to pale yellow solution in a single-dose vial.
Available data from published case reports, a registry with a pregnancy sub-study and pharmacovigilance reports with VIMIZIM use during pregnancy have not identified a drug-associated risk of major birth defects, miscarriage, or adverse maternal or fetal outcomes. Limitations of the available data include a small number of exposed cases and missing data.
In animal reproduction studies, no effects on embryo-fetal development were observed in rats given daily administration of elosulfase alfa up to 33 times the human steady-state AUC (area under the concentration-time curve) at the recommended human weekly dose pre-mating and through the period of organogenesis. No effects on embryo-fetal development were observed in rabbits given daily administration of elosulfase alfa at doses up to 8 times the human steady-state AUC at the recommended weekly dose during organogenesis, which produced maternal toxicity. A dose-dependent increase in stillbirths was observed when elosulfase alfa was administered daily in rats during organogenesis through lactation at doses 5 times the human steady-state AUC at the recommended human weekly dose. An increase in pup mortality was observed at doses producing maternal toxicity.
The background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively.
Pregnancy can exacerbate preexisting clinical manifestations of MPS and lead to adverse outcomes for both mother and fetus.
All reproductive studies with rats included pre-treatment with diphenhydramine to prevent or minimize hypersensitivity reactions. The effects of elosulfase alfa were evaluated based on comparison to a control group treated with diphenhydramine alone. Daily intravenous administration of up to 20 mg/kg elosulfase alfa in rats (33 times the human steady-state AUC at the recommended weekly dose of 2 mg/kg) during a 15-day pre-mating period, mating, and the period of organogenesis, produced no maternal toxicity or effects on embryo-fetal development. Daily intravenous administration of up to 10 mg/kg in rabbits (8 times the human steady-state AUC at the recommended weekly dose) during the period of organogenesis had no effects on embryo-fetal development. However, maternal toxicity (gross changes in liver) was observed in rabbits given doses of 1 mg/kg/day and higher (0.1 times the human steady-state AUC at the recommended weekly dose). Elosulfase alfa produced an increase in the percentage of stillbirths when administered daily to rats at intravenous doses of 6 mg/kg and higher (5 times the human steady-state AUC at the recommended weekly dose) during the period of organogenesis through lactation. Daily intravenous administration of 20 mg/kg (33 times the human steady-state AUC at the recommended weekly dose) produced maternal toxicity and an increase in mortality of offspring during the lactation period. This study lacked a full evaluation of neurodevelopmental milestones; however, no effects of elosulfase alfa were noted in tests for learning and memory