How many times a week is betaseron injected?

Standard Dosing for Betaseron

Betaseron (interferon beta-1b) is injected subcutaneously every other day, which equals about 3-4 times per week.[1] This schedule targets relapsing forms of multiple sclerosis (MS) by reducing relapse frequency and lesion activity.

Why Every Other Day?

The dosing stems from clinical trials showing efficacy with 0.25 mg (8 million international units) administered on alternate days. Daily use isn't approved or recommended due to injection site reactions and flu-like symptoms that improve with this spacing.[2][3]

How Patients Handle the Schedule

Most inject Monday, Wednesday, Friday, and one extra day (like Sunday), totaling four doses weekly. Missing a dose means resuming the next scheduled day without doubling up. Refrigeration is required until 30 minutes before use; room temperature stability lasts up to 3 hours.[1]

Common Side Effects Tied to Frequency

Frequent injections often cause local skin reactions (redness, pain) in 70-85% of patients, plus flu-like symptoms (fever, chills) after 60% of doses initially. These decrease over time; rotating sites and pre-medication with ibuprofen help.[2]

Comparison to Other MS Injectables

• Avonex (interferon beta-1a): Once weekly IM injection.
  
• Rebif (interferon beta-1a): 3 times weekly SC.
  
• Plegridy (peginterferon beta-1a): Every 2 weeks SC.
  Betaseron's more frequent schedule offers steadier drug levels but higher injection burden.[3]
  
  [1] Betaseron Prescribing Information (Bayer HealthCare)
  [2] National MS Society - Interferon Beta-1b
  [3] Drugs.com - Betaseron Dosage Guide