

Synvisc is an injection used to relieve knee osteoarthritis pain. It contains Hylan G‑F 20, a gel‑like substance similar to the body’s natural joint fluid, helping the knee move more smoothly and with less pain. It is given as a series of three weekly injections and must be administered by a healthcare professional.
| Product Name | Synvisc |
|---|---|
| Active Ingredient | Hylan G-F 20 |
| Drug Class | Viscosupplementation agents |
| FDA Approval Status | FDA-approved to treat knee osteoarthritis pain |
| Available Forms | Pre-filled syringe |
| Strengths Available | 6 mL |
| Routes of Administration | Intra-articular injection |
| Administration Frequency | Once weekly for 3 weeks (standard Synvisc regimen) |
| Synvisc Uses | Knee osteoarthritis pain relief treatment |
| Synvisc Contraindications | Hypersensitivity to hyaluronan or avian proteins (birds, feathers, eggs) Knee joint infections or skin infections at the injection site |
| Synvisc Storage | Store at room temperature, below 30°C (86°F) |
| Prescription Required | Rx only |
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Synvisc is FDA-approved for:
If you are prescribed to use Synvisc for knee pain, follow these administration guidelines:
Follow this Synvisc dosage guide table to treat knee osteoarthritis pain effectively:
| Product | Indication | Dosage | Administration Schedule | Injection Site |
|---|---|---|---|---|
| Synvisc (Hylan G-F 20) | Osteoarthritis (OA) of the knee | 2 mL per injection | 1 injection weekly for 3 weeks (total = 3 injections) | Intra-articular (into the knee joint) |
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Synvisc works by replacing and improving the natural fluid inside your knee joint. In osteoarthritis, the synovial fluid (the fluid that cushions and lubricates the joint) becomes thinner and less effective. Synvisc contains hylan G‑F 20, a gel‑like substance similar to the body’s own hyaluronic acid. When injected into the knee, it helps restore the fluid’s shock‑absorbing and lubricating properties, reducing friction between bones. This makes movement smoother, eases pain, and can improve mobility for several months. In simple terms, Synvisc acts like a “cushion” inside the knee, helping the joint glide more comfortably again.
If you miss a Synvisc injection appointment, let your doctor know right away so it can be rescheduled. Since Synvisc is only given in a clinic, your provider will need to adjust the timing to keep the treatment plan for osteoarthritis pain effective.
Taking two doses of Synvisc close together is not recommended. However, Synvisc is always administered by a healthcare professional, and dosing errors are rare. If you are concerned that you may have received more than the recommended amount, contact the poison control center or your healthcare provider immediately. Do not wait for Synvisc overdosing symptoms to appear.
Here are some Synvisc injection side effects you may experience:
| Common Side Effects of Synvisc Injection | Rare or Serious Side Effects of Synvisc Injection |
|---|---|
| Pain at the injection site | Severe joint inflammation |
| Swelling in the knee | Infection at the injection site |
| Warmth or redness around the joint | Allergic reaction (avian protein sensitivity) |
| Stiffness or reduced mobility | Fluid buildup (large effusion) |
| Local bruising | Continuous or worsening pain or swelling |
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When you consider the Synvisc for knee osteoarthritis pain, you must know about the following associated warnings:
Yes, Synvisc needs to be refrigerated to keep it stable and effective. It should be stored properly until a healthcare professional uses it. Follow these Synvisc storage guidelines:
Here are the Synvisc interactions you should know before starting knee osteoarthritis pain relief treatment:
Consider the following Synvisc alternatives if this medication doesn’t provide knee osteoarthritis pain relief:
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This information is provided on this page for general educational purposes. This should not be considered as any medical advice, diagnosis, or treatment. Synvisc injections must always be prescribed and administered by a licensed doctor. Individual treatment plans, dosing schedules, and safety considerations may vary based on your medical condition, history, and overall health. Do not start, stop, or change Synvisc dosing without consulting your doctor. If you experience any side effects, allergic reactions, worsening pain, or unusual symptoms, seek medical attention immediately.

Dr. Jackson Miller is a board-certified medicine physician & hospitalist. He is a healthcare professional with a strong background in patient care. With years of experience and a patient-first approach, he believes the foundation of good health is a patient who feels informed and empowered. He contributes to medical content review, drawing on his background in clinical practice and patient education. He focuses on presenting health information in a clear, accurate, and accessible way to help readers make informed decisions. His work emphasizes clarity, evidence-based guidance, and understandable explanations of medical topics.
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