Which medication class is an established disease-modifying therapy for multiple sclerosis?

• A. Interferon-β1a
• B. Corticosteroids
• C. Antibiotics
• D. Anticoagulants

Answer: (A)

Disease-modifying therapies for multiple sclerosis aim to change the disease course by dampening the immune attack on the central nervous system and reducing relapse frequency. Interferon-β1a fits this role because it modulates the immune response—shifting the balance away from proinflammatory activity, reducing T-cell migration into the CNS, and decreasing inflammatory demyelination. Clinically, this translates to fewer relapses and slower accumulation of disability in relapsing forms of MS, evidence that it can alter the long-term trajectory of the disease.

Corticosteroids, by contrast, are used to shorten and lessen the severity of acute relapses but do not change the overall progression of the disease. Antibiotics and anticoagulants do not modify the underlying autoimmune demyelination in MS.