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Plegridy
Peginterferon Beta‑1a
$3480.00
125mg · 3 × 2 · 3 months supply
BrandBranded medicine· By Biogen
$1160.00 per month
Strength
How long a supply?
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Ships cold, in insulated packing
This medicine ships in insulated packing with coolant and carries its own shipping charge, shown at checkout.
Annual cost
$15080a year at this pack size
Prescription required
Upload your prescription after ordering, or send it to our pharmacy team. We dispense only against a valid prescription.
63mg
125mg
About Plegridy
Overview
Plegridy contains peginterferon beta-1a, an interferon beta medicine. It is used in adults to treat relapsing forms of multiple sclerosis (MS), including clinically isolated syndrome, relapsing-remitting MS and active secondary progressive MS. How Plegridy produces its effects in people with MS is not known.
What it treats
Relapsing forms of multiple sclerosis (MS) in adults, including clinically isolated syndrome, relapsing-remitting MS, and active secondary progressive MS.
Safety information
Side effects
Common side effects include redness, pain or itching at the injection site; flu-like symptoms; fever; headache; muscle aches; chills; weakness; and joint pain. Serious side effects include liver injury, depression or suicidal thoughts, severe allergic reactions including anaphylaxis, injection-site tissue death, congestive heart failure, reduced blood cell counts, blood clots in small blood vessels (thrombotic microangiopathy), high blood pressure in the arteries of the lungs (pulmonary arterial hypertension), autoimmune disorders and seizures. Contact a doctor immediately if you develop symptoms of depression or suicidal thoughts, or experience a serious allergic reaction. Contact your doctor promptly about other suspected serious side effects. Liver function and complete blood counts need monitoring during treatment. People with significant existing heart disease need monitoring for worsening heart symptoms. Do not inject into affected skin until it has fully healed.
When to call your doctor
If symptoms are severe or getting worse quickly, seek emergency care rather than waiting.
Before taking this medicine
Do not use Plegridy if you have a history of an allergic reaction to natural or recombinant interferon beta, peginterferon, or any ingredient in Plegridy. Conditions requiring caution include liver problems, depression or suicidal thoughts, significant heart disease, low blood cell counts, autoimmune disorders and severe kidney impairment. Liver function and complete blood counts should be monitored. People with significant heart disease should be monitored for worsening symptoms, and those with severe kidney impairment should be monitored for side effects. Report any symptoms of depression or suicidal thoughts to your healthcare provider immediately. Plegridy must be stopped if a serious allergic reaction occurs, if symptoms and laboratory findings indicate thrombotic microangiopathy (a condition involving blood clots in small blood vessels), or if pulmonary arterial hypertension (high blood pressure in the lung arteries) is diagnosed. Your prescriber may also consider stopping treatment if liver injury, depression or a new autoimmune disorder occurs. Do not inject into an affected area of skin until it has fully healed. If several skin lesions develop, the injection site should be changed or treatment interrupted until they heal. During pregnancy, human data do not show a clear link between interferon beta use and major birth defects, but animal data suggest it may harm the unborn baby.
Using Plegridy
Dosing
Dosing is set by your prescriber. Each health care professional may prescribe medication differently according to a patient's medical history and condition, so follow the directions on your prescription label and speak to your doctor or pharmacist before changing anything.
Storage
Store in the original carton to protect it from light. Check the pack for whether it must be refrigerated before first use and how long it may be kept at room temperature afterwards. Keep all medicines out of the sight and reach of children.
Clinical information on this page is summarised from the US FDA label PLEGRIDY (PEGINTERFERON BETA-1A) INJECTION, SOLUTION PLEGRIDY PEN (PEGINTERFERON BETA-1A) INJECTION, SOLUTION PLEGRIDY (PEGINTERFERON BETA-1A) KIT [BIOGEN INC.] (DailyMed, retrieved 19 September 2026).
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