How Often Is Rebif Taken?
Rebif (interferon beta-1a) is injected subcutaneously three times per week, typically on alternate days like Monday, Wednesday, and Friday. Doses are either 22 mcg or 44 mcg per injection, depending on the prescribed strength.[1]
What If I Miss a Dose?
Skip the missed dose and resume your regular schedule. Do not double up. Injections should be spaced at least 48 hours apart to avoid side effects like flu-like symptoms.[1][2]
How Does the Dosing Schedule Compare to Other MS Drugs?
| Drug | Frequency | Type |
|------|-----------|------|
| Rebif | 3x/week subcutaneous | Interferon beta-1a |
| Avonex | 1x/week intramuscular | Interferon beta-1a |
| Betaseron | Every other day subcutaneous | Interferon beta-1b |
| Plegridy | Every 2 weeks subcutaneous | Peginterferon beta-1a |
| Ocrevus | Every 6 months IV | Monoclonal antibody |
Rebif's schedule balances efficacy with fewer injections than daily options like Copaxone (daily subcutaneous).[2][3]
Why Three Times a Week Specifically?
This frequency maintains steady interferon levels to reduce MS relapses, based on clinical trials like PRISMS showing 30% relapse reduction versus placebo. More frequent dosing increases injection-site reactions and flu-like symptoms.[3]
Starting and Titration Schedule
Begin with a lower dose (e.g., 8.8 mcg three times weekly for 44 mcg target) and increase weekly over 4 weeks to minimize side effects. Full dose reaches 44 mcg by week 5.[1]
Storage and Injection Tips Patients Search For
Store in fridge at 2-8°C (36-46°F); allow to warm to room temperature before injecting. Rotate sites (abdomen, arms, thighs, buttocks). Use within 30 days of first puncture.[1][2]
[1]: Rebif Prescribing Information (EMD Serono)
[2]: Drugs.com - Rebif Dosage Guide
[3]: National MS Society - DMT Comparison