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Alimta ® (pemetrexed for injection)
This information is intended for UK registered healthcare professionals only as a scientific exchange in response to your search for information. Please refer to the link for full prescribing information:
Alimta Summary of Product Characteristics (SmPC)
Alimta® (pemetrexed): Vitamin Supplementation
Prior to pemetrexed treatment, initiate vitamin supplementation consisting of oral folic acid and IM vitamin B12 to reduce severity of pemetrexed toxicity.
To reduce toxicity, patients treated with pemetrexed must be instructed to take a folic acid preparationor a multivitamin with folic acid
as a daily oral low-dose
initiatedduring the 7-day period preceding the first dose of pemetrexed, and for at least 5 doses, and
during the full course of therapy and for 21days after the last dose of pemetrexed.1
In clinical trials, the dose of folic acid studied ranged from 350 to 1000 μg. The most commonly used dose of oral folic acid in clinical trials was 400 μg.2
Patients must also receive vitamin B12
as an IM injection
initiated the week preceding the first dose of pemetrexed, and
Subsequent vitamin B12 injections may be given the same day as pemetrexed.1 In clinical trials, the dose of vitamin B12 received was 1000 μg.2
Effects of Vitamin Supplementation on Toxicity
In the phase 3 malignant pleural mesothelioma (MPM) registration trial, pretreatment with folic acid and vitamin B12 led to overall less toxicity and reduction in grade3/4 hematologic and nonhematologic toxicities such as
Therefore, patients treated with pemetrexed must be instructed to take folic acid and vitamin B12as a prophylactic measure to reduce treatment-related toxicity.2
Effects of Vitamin Supplementation on Pharmacokinetics
The pharmacokinetics (PK) of pemetrexed is not influenced by oral folic acid and IM vitamin B12 supplementation.2
1Alimta [summary of product characteristics]. Eli Lilly Nederland B.V., The Netherlands
2Data on file, Eli Lilly and Company and/or one of its subsidiaries.
3Vogelzang NJ, Rusthoven JJ, Symanowski J, et al. Phase III study of pemetrexed in combination with cisplatin versus cisplatin alone in patients with malignant pleural mesothelioma. J Clin Oncol. 2003;21(14):2636-2644. https://doi.org/10.1200/JCO.2003.11.136
Date of Last Review:May 27, 2021
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