Introduction: Interferon (IFN) beta-1a, 44 micrograms, administered three times a week (tiw), is the recommended dose in 'relapsing' multiple sclerosis. During the clinical practice, physicians initiate treatment either with this complete dose, or with escalating dose.
Aim: To determine safety of IFN beta-1a 44 micrograms tiw, comparing a complete dose initiation regimen versus an escalating dose initiation.
Patients and methods: A total of 247 multiple sclerosis patients were enrolled in this study from 37 different Spanish centers, who initiated treatment with IFN beta-1a 44 micrograms tiw. Safety and tolerability was compared in patients switching from other previous interferon to a direct complete dose regime of IFN beta-1a 44 micrograms tiw vs. an escalating dose regime in naive multiple sclerosis patients.
Results: Adverse events were more frequent when administrating interferon in a 'fast-regime' directly with a complete dose.
Conclusions: An escalating dose with IFN beta-1a 44 micrograms tiw is recommended to initiate treatment in multiple sclerosis patients. In patients previously treated with another interferon beta, a complete dose regime initiation can be also scheduled, without significant differences in the reporting of adverse events.