Synovial

Quick links to important sections

Synovial

Treatment option:

Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Synovial

Property Description
Active Ingredient Diclofenac (as Diclofenac Sodium)
Pharmacological Class Non-Steroidal Anti-Inflammatory Drug (NSAID)
Form Tablet, capsule, solution, gel, patch, suppository
Common Use Relief of pain, swelling, and inflammation
Origin Synthetic phenylacetic acid derivative

What Type of Medicine is Synovial, and What is its Composition?

Synovial is a branded pharmaceutical preparation whose core medicine is Diclofenac, classifying it as a Non-Steroidal Anti-Inflammatory Drug (NSAID). Its active ingredient is typically Diclofenac Sodium, which is a synthetic compound chemically categorized as a phenylacetic acid derivative. This medicine is designed as a single-ingredient product.

The formulation determines the specific base/vehicle used. For example, the drug may utilize a hydrophilic gel base for topical application, intended for local action, or be prepared as solid tablets for oral ingestion, targeting the systemic circulation. This versatility in dosage forms and route of administration relates to the ability of Diclofenac to reach concentrations at the site of inflammation.

What is the General Purpose of Synovial?

The fundamental general purpose of Synovial is to achieve analgesic (pain-relieving) and anti-inflammatory effects. This action is recognized for its efficacy in providing relief from various types of physical discomfort and swelling, such as managing pain associated with an acute sprain or chronic joint issues.

Its function is centered on its mechanism of effect—interfering with the synthesis of prostaglandins, which are chemical messengers responsible for transmitting pain signals and initiating swelling. By reducing the level of these pro-inflammatory substances, the drug provides a measurable general benefit through the reduction of discomfort, swelling, and fever.

Regulatory References

  1. Diclofenac Monograph | LiverTox - NIH
  2. Diclofenac: MedlinePlus Drug Information

What side effects are possible with Synovial?

Possible Side Effects and Safety Information

The official safety profile for afamitresgene autoleucel (marketed as Synovial in this context) highlights several critical adverse reactions documented by government regulatory bodies, particularly the US FDA.

Mandatory Safety Restrictions and Serious Events

The medicine carries a Boxed Warning in its official regulatory labeling to address the risk of Cytokine Release Syndrome (CRS), which may be severe or life-threatening. CRS was observed in a high percentage of patients during clinical trials, with common symptoms including fever, tachycardia, and hypotension.

Additionally, the therapy is associated with the potential for Immune Effector Cell-associated Neurotoxicity Syndrome (ICANS). Safety information notes that symptoms may include confusion, language difficulties, and seizures. Patients must be monitored closely for signs of CRS and ICANS for at least four weeks following administration.

Common Adverse Reactions and Laboratory Findings

The following are among the most common adverse reactions (ge 20%) reported in clinical data, grouped by system-organ class:

  • Systemic Symptoms: Nausea, vomiting, fatigue, pyrexia (fever), constipation, decreased appetite, and edema (swelling).
  • Cardio-Respiratory: Dyspnea (shortness of breath), tachycardia (fast heart rate), hypotension (low blood pressure), and non-cardiac chest pain.
  • Infections: Infections were reported in a significant number of patients.

Laboratory Abnormalities

Severe (Grade 3 or 4) laboratory abnormalities that occurred in a high percentage (ge 20%) of patients include decreases in key blood cell counts, such as lymphocyte count, neutrophil count, white cell count, red blood cell count, and platelet count. These prolonged severe cytopenias can persist for several weeks and require monitoring.

Safety Limitations

The regulatory basis for this therapy includes a limitation that it should not be administered to patients who are heterozygous or homozygous for the HLA-A*02:05P gene type. Due to the risk of serious complications, administration is restricted to healthcare facilities with immediate access to personnel and equipment trained to manage severe adverse reactions.

Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory profile for Diclofenac (Synovial) overdose describes potential manifestations that include gastrointestinal symptoms such as nausea, vomiting, and abdominal pain. Central nervous system (CNS) effects are also documented, presenting as drowsiness, headache, dizziness, and tinnitus, although the initial stage may be asymptomatic.

The primary concern documented by regulatory bodies is the potential for severe or life-threatening outcomes following a substantial overdose. These include serious organ-system effects, specifically acute renal failure, hepatotoxicity (hepatic failure), and major gastrointestinal complications like bleeding or perforation. Severe CNS depression, confusion, and generalized convulsions or coma are also officially recognized risks that require critical observation.

Since no specific antidote is known according to regulatory documentation, immediate action is mandatory. Urgent medical attention must be sought immediately for any known or suspected overdose. The management strategy described is strictly symptomatic and supportive. Procedural steps like the administration of activated charcoal or gastric lavage are time-dependent considerations only for patients presenting soon after ingesting a large, potentially toxic amount. The elderly and individuals with existing dehydration or organ impairment are noted to be at increased risk for these severe manifestations.

Therapeutic Uses of Synovial

Main Uses and Benefits of Synovial

Synovial is a therapeutic intervention primarily utilized for the management of joint-related conditions characterized by the degradation of synovial fluid quality. It is designed to supplement the body’s natural lubrication within the joint space, particularly in cases where the endogenous fluid has lost its viscoelastic properties.

Primary Indications

The most common application for Synovial is the treatment of symptoms associated with osteoarthritis. This degenerative joint disease involves the progressive breakdown of cartilage and changes in the synovial fluid, leading to friction and discomfort during movement. Synovial is used to:

  • Restore Viscoelasticity: By introducing exogenous hyaluronic acid, the treatment aims to return the synovial fluid to a healthier, more functional state.
  • Support Joint Mechanics: It acts as a lubricant and shock absorber, reducing the mechanical stress placed on the articular surfaces during physical activity.
  • Address Chronic Joint Discomfort: It is typically indicated for patients who have not achieved sufficient relief through conservative non-pharmacological therapies or simple analgesics.

Therapeutic Benefits

The objective of Synovial treatment is to improve the physiological environment of the affected joint. This process offers several key benefits aimed at enhancing the patient's quality of life:

  • Improved Mobility: By reducing friction within the joint capsule, the treatment can help facilitate a smoother range of motion, making daily movements more fluid.
  • Reduction in Stiffness: Patients often experience a decrease in the morning stiffness or inactivity-related rigidity commonly associated with degenerative joint conditions.
  • Protection of Joint Structures: While not a cure for osteoarthritis, improving the lubrication within the joint may help provide a protective buffer for the remaining cartilage surfaces.
  • Localized Action: Because it is applied directly to the site of the condition, it provides targeted support to the specific joint requiring intervention without systemic involvement.

Regulatory References

  1. NIH MedlinePlus guidance

Eligibility and Restrictions for Use

Who Can and Cannot Use Synovial (Intra-Articular) Treatments

Official regulatory documentation for intra-articular injectable products (e.g., corticosteroids or hyaluronates) defines eligibility based on several critical criteria to ensure safe use.

Absolute Contraindications

Use is strictly prohibited for patients with a known hypersensitivity or allergy to any component of the formulation. The presence of an active infection in the joint (septic arthritis) or a systemic fungal infection is also an absolute contraindication, as administration could worsen the condition.

Restricted or Conditional Use

Eligibility is limited for specific patient groups and conditions:

  • Age: Certain formulations containing preservatives like benzyl alcohol are contraindicated in neonates. Specific intra-articular products may be restricted to adult patients (18 years and older).
  • Pregnancy and Lactation: Use during pregnancy is classified as conditional, requiring a clinical risk-benefit assessment. Caution is advised for nursing mothers, as components may appear in breast milk.
  • Comorbidities: Caution is required for patients with certain active conditions, including gastrointestinal issues like active peptic ulcers, due to the risk of systemic complications from absorbed components. Use in joints other than the approved site (e.g., the knee for most hyaluronates) is often considered not established.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documents define specific restrictions and requirements for the co-administration of Synovial (Diclofenac) with other substances. The profile is structured around prohibiting combinations that increase clinically significant risks or modify drug exposure.

Documented Interaction Classifications

Co-administration with other systemic Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) is not recommended due to a documented increase in the risk of serious gastrointestinal events. The medicine is formally contraindicated for managing peri-operative pain in the setting of Coronary Artery Bypass Graft (CABG) surgery.

Pharmacodynamic and Exposure Effects

Interacting Substance Category Official Interaction Pattern
Anticoagulants and Antiplatelet Agents Increases the risk of serious bleeding due to additive pharmacodynamic effects.
ACE Inhibitors / ARBs / Diuretics May diminish the antihypertensive or natriuretic effects; increases risk of renal function deterioration.
Voriconazole (CYP2C9 Inhibitor) Results in a pharmacokinetic interaction that increases Diclofenac's plasma exposure (AUC).
Methotrexate / Lithium / Digoxin May increase the serum concentration and potential toxicity of these co-administered drugs.

Administration Constraints

Mandatory time separation is required when co-administering with Mifepristone; Diclofenac should not be administered for eight to twelve days following Mifepristone administration. Alcohol co-administration is noted to increase the risk of serious gastrointestinal adverse events. The increased risk of renal deterioration with ACE inhibitors and ARBs is noted as having greater clinical significance in elderly and volume-depleted patients.

Mechanism of Action

How Synovial Works: Mechanism of Action

The mechanism of action for Synovial (Diclofenac) is defined by its inhibitory interaction with the Cyclooxygenase (COX) enzyme system, resulting in modulations of specific physiological responses. Diclofenac acts as a competitive inhibitor of both the constitutive COX-1 and inducible COX-2 enzymes. By blocking the active site, the drug prevents the conversion of arachidonic acid, thereby suppressing the Eicosanoid Synthesis Pathway. This initial molecular step profoundly reduces the formation of prostaglandins ( PGE2) and related prostanoids.

This consequential reduction in PGE2 results in key physiological effects. It diminishes the sensitization of peripheral nociceptors, increasing the stimulus required for signal transduction. It also restricts vascular permeability and fluid extravasation, which influences local edema, and mediates hypothalamic thermal control. The drug's mechanism is further characterized by its sustained presence in localized areas like synovial fluid. This mechanism modulates the immediate biochemical output of the inflammatory process, but does not alter the upstream cellular drivers of chronic tissue remodeling.

Dosage and Administration Information

Synovial (often containing hyaluronic acid products like Synvisc-One) is administered as an intra-articular injection for the treatment of pain associated with osteoarthritis, most commonly in the knee. This procedure, known as viscosupplementation, must be performed only by a qualified healthcare professional, such as a physician, using strict aseptic technique to prevent joint infection.


Procedure and Dosage

The treatment involves injecting the product directly into the joint space. The specific dosing schedule varies based on the formulation: some products require a single injection, while others are administered as a series of injections given once a week for three to five weeks.

  • Before the injection, the healthcare provider may aspirate (remove) any excess synovial fluid or effusion from the joint to relieve pressure and ensure optimal placement of the product.
  • A local anesthetic may be used to minimize discomfort during the procedure.
  • In some cases, imaging guidance (such as fluoroscopy or ultrasound) is employed to confirm the correct placement of the needle within the joint space.

Post-Injection Care

Patients are typically advised to avoid strenuous or prolonged weight-bearing activities for approximately 48 hours following the injection. This includes activities like jogging, heavy lifting, and standing for long periods. Temporary side effects, such as mild pain, swelling, or warmth at the injection site, are common and can often be managed with rest and the application of an ice pack. Contact your healthcare provider immediately if you experience severe or persistent symptoms, which could indicate a rare complication.

Recent Clinical Evidence

Research Evidence / Overview of Studies


Efficacy in Acute Pain Management

Research has evaluated whether this treatment is suitable for acute pain. Research has focused on the study of how this agent may affect the experience of pain. This approach has been the focus of numerous randomized controlled trials (RCTs).

  • Comparison to Placebo: The trials investigated the outcome of pain scores, and findings indicated a reported difference compared to the change reported by the control group (placebo). This difference was described in the research as statistically notable.
  • Opioid Sparing: Studies investigated the potential relationship between this agent's use and changes in the use of other analgesics for breakthrough pain. Findings related to this outcome were varied across the included trials.
  • Onset and Duration of Effect: Studies examined whether the reported effect occurred early and whether the reported reduction in pain severity was maintained over time.

Combination Therapy vs. Monotherapy

A meta-analysis evaluated the use of this agent in combination with another approved analgesic compared to using either agent alone (monotherapy). The studies evaluated whether the combination therapy offered different results compared to monotherapy.

The combination therapy was explored in studies with the objective of evaluating results when using lower doses of individual drugs.

  • Dosage Utilized: The research trials commonly used the lowest available dosage during the initial phase of treatment.

Frequently Asked Questions (FAQ)

Common questions about Synovial (FAQ)

Q: Is there a maximum age limit mentioned for starting Synovial treatment?

Official regulatory summaries, such as those for Diclofenac, do not typically specify a maximum age cut-off. However, use in older adults is subject to careful risk assessment. Official guidance emphasizes the principle of minimizing exposure (lowest effective dose for the shortest duration) to manage increased risks associated with age, such as cardiovascular and gastrointestinal issues.


Q: What tests or screenings are generally required before starting treatment with Synovial?

Due to the potential risk of liver damage (hepatotoxicity) associated with Diclofenac, regulatory documents recommend testing liver enzyme levels (transaminases) within the first four to eight weeks of starting treatment. These tests are also subject to periodic repetition during long-term use.


Q: How long do common side effects from Synovial typically last?

Regulatory information indicates that many common side effects, such as dizziness or mild digestive upset, should decrease or wear off as the body adjusts to the medicine. Official guidance typically advises that if symptoms do not improve or worsen after a short period, generally about seven days, medical consultation is generally advised.


Q: Can Synovial affect mental health or mood, according to official reports?

Official regulatory information lists several central nervous system effects, including headache and dizziness, as possible reactions. For one form of the product mentioned (afamitresgene autoleucel), a rare but serious adverse reaction called ICANS, which can cause confusion and changes in mental state, is noted as a specific risk in the safety information.


Q: Is there a regulatory warning about Synovial and liver function or kidney function?

Yes, there are official warnings regarding both liver and kidney function. Treatment with Diclofenac carries a warning for potential liver damage (hepatotoxicity), which can be severe. Regulatory documents also note that the drug can increase the risk of kidney function deterioration (renal risk), especially when combined with certain blood pressure medications.


Q: Can people with pre-existing heart conditions use Synovial?

Systemic use of Diclofenac is formally contraindicated (should not be used) in patients with established heart conditions, including congestive heart failure, ischaemic heart disease, or cerebrovascular disease. This restriction is in place because of the small increased risk of arterial thrombotic events, such as heart attack or stroke.


Q: How quickly does Synovial start to show its initial therapeutic effects?

The time it takes to feel the first therapeutic effects varies depending on the specific product formulation. Regulatory data suggests that some fast-acting oral forms may start working within 30 minutes. In contrast, topical gels may take around four days to achieve a significant reported reduction in pain.


Q: What is the primary difference between the injectable and oral dosage forms of Synovial?

Clinical trial summaries suggest the injectable forms are designed to provide a more rapid onset of pain relief in the initial half-hour after administration. However, the oral forms typically achieve the same ultimate level of pain reduction as the injectable forms.


Q: Why is Synovial categorized as a 'biologic' or 'targeted therapy'?

The core medicine Diclofenac is classified as an NSAID, which is not a biologic or targeted therapy. However, the name 'Synovial' appears in medical contexts referring to different products, including Hyaluronic Acid and a cell therapy (afamitresgene autoleucel). This cell therapy is classified as a targeted biologic, leading to the different categorizations.


Q: Is Synovial considered a short-term or long-term medication?

Diclofenac is generally not recommended for long-term use. Official regulatory guidance emphasizes the principle of using the lowest effective dose for the shortest duration possible to reduce the risk of serious adverse effects.


Q: What happens if a dose of Synovial is missed?

If a dose is missed, patient information advises taking it as soon as it is remembered. However, if it is close to the time for the next scheduled dose, the missed dose is typically skipped. Patient materials advise against taking a double dose.


Q: Can Synovial be used as needed, or does it require continuous use for effect?

The frequency of use depends entirely on the specific product formulation and condition being addressed. Some forms, such as those used for migraine, are usually taken only as needed. Other forms used for chronic conditions, such as arthritis, are typically taken on a regular, scheduled basis.


Q: Are there any known long-term health effects associated with Synovial use?

Long-term use, especially at high doses, is associated with an increased risk of serious cardiovascular events (heart attack and stroke) and gastrointestinal events (ulcers and bleeding). Due to these risks, official bodies require periodic reassessment of treatment need and risk factors.


Q: Are there any specific foods or dietary supplements that interact with Synovial?

Official regulatory warnings note a need for caution regarding complementary medicines, herbal remedies, and supplements. This guidance is issued because there is generally insufficient data available to definitively state whether they are safe to take concurrently with Diclofenac.


Q: Is it safe to receive routine vaccinations while undergoing treatment with Synovial?

Research suggests that taking NSAIDs, like Diclofenac, at the same time as receiving certain vaccinations may be associated with a potential decrease in the resulting antibody response. However, using the medicine for fever or pain after vaccination is generally considered acceptable.


Q: Does Synovial interact with common birth control methods?

According to official patient information, Diclofenac does not appear to affect the efficacy or performance of common hormonal contraceptives, including both the combined oral contraceptive pill and the progestogen-only pill.


Q: If treatment is stopped, how long does the drug remain detectable in the body's system?

Regulatory pharmacokinetic data indicates that Diclofenac has a relatively short elimination half-life, which is the time required for half the drug to be removed from the bloodstream. This half-life is approximately 1.2 to 2 hours.


Q: Where can a user find the official, full prescribing information for Synovial?

The official, full prescribing information, known as the FDA Label in the US or the Summary of Product Characteristics (SmPC) in Europe, is made publicly available by regulatory agencies. This information can be found on government drug information websites such as DailyMed or the European Medicines Agency (EMA).


Q: Are there ongoing studies examining Synovial in patient populations beyond the original indication?

Government research databases, such as ClinicalTrials.gov (run by the National Institutes of Health), list ongoing clinical studies. These databases show research investigating Diclofenac for various indications and patient groups outside of its primary approved use.


Q: What is the purpose and importance of the patient Medication Guide that comes with Synovial?

The Patient Medication Guide is a document required by the FDA for certain drugs, including NSAIDs like Diclofenac. Its primary purpose is to provide patients with important safety information regarding potential serious risks, such as the increased chance of heart attack, stroke, and stomach bleeding, in clear and simple language.

How should Synovial be stored and disposed of?

Official Storage and Disposal Instructions

Synovial (Diclofenac) must be stored strictly according to regulatory labeling to maintain product stability and safety.

Requirement Official Regulatory Statement
Storage Temperature Room temperature, defined as 20°C to 25°C (68°F to 77°F), with excursions allowed up to 30°C (86°F).
Environmental Protection Store away from moisture and direct light. The product must not be frozen.
Container & Handling Keep in the original, tightly closed container and do not keep outdated medicine.
Child Safety Keep out of the sight and reach of children and pets.
Disposal Consult a pharmacist or healthcare professional for disposal. Do not discharge into drains or water courses to prevent environmental release.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

Equivalent of Synovial found in:

A-Z Index: