Reactin SR 100mg (Diclofenac)

Introduction

Reactin SR 100mg is a sustained-release formulation containing Diclofenac, a widely used nonsteroidal anti-inflammatory drug (NSAID). It is commonly prescribed to relieve pain, inflammation, and swelling caused by various musculoskeletal and inflammatory conditions. The sustained-release (SR) form provides a gradual release of the medicine, ensuring long-lasting symptom relief and reducing the need for frequent dosing.

What is Diclofenac?

Diclofenac is a nonsteroidal anti-inflammatory medication that belongs to the arylacetic acid derivative class of NSAIDs. It possesses anti-inflammatory, pain-relieving (analgesic), and fever-reducing (antipyretic) properties by blocking substances in the body responsible for pain and inflammation.

Mechanism of Action

Diclofenac works by inhibiting cyclooxygenase (COX) enzymes, specifically COX-1 and COX-2. These enzymes are responsible for converting arachidonic acid into prostaglandins, which contribute to pain, swelling, and inflammation.

• COX-1 inhibition: Reduces protective prostaglandins in the stomach lining, which may increase the risk of gastrointestinal side effects.
• COX-2 inhibition: Primarily responsible for the medicine’s anti-inflammatory and pain-relieving effects.

By reducing prostaglandin production, Diclofenac helps relieve pain, decrease swelling, and reduce inflammation.

Pharmacokinetics

• Absorption: The sustained-release formulation allows slow and continuous absorption, maintaining stable blood levels for approximately 12–24 hours.
• Distribution: Diclofenac is highly protein-bound (approximately 99%), mainly to albumin.
• Metabolism: It is extensively metabolized in the liver, primarily through CYP2C9 enzymes.
• Elimination: The medicine is excreted mainly through urine and bile. Although Diclofenac has a short half-life, the SR formulation extends its therapeutic effect.

Clinical Uses of Reactin SR 100mg

Reactin SR 100mg is commonly prescribed for the management of:

1. Rheumatoid Arthritis

A chronic autoimmune condition that causes inflammation, pain, and stiffness in joints.

2. Osteoarthritis

A degenerative joint disease that leads to joint pain and reduced mobility.

3. Ankylosing Spondylitis

A chronic inflammatory condition affecting the spine and large joints.

4. Acute Musculoskeletal Pain

Used for conditions such as sprains, strains, muscle injuries, and back pain.

5. Postoperative Pain and Inflammation

Helps reduce pain and swelling after surgical procedures.

The sustained-release form is especially useful for chronic conditions requiring continuous pain management.

Dosage and Administration

• Typical Dose: Usually 100mg once daily, or as directed by a healthcare professional.
• How to Take: Swallow the tablet whole with water.
• With Food: It is best taken with food or milk to reduce stomach irritation.
• Do Not Crush or Chew: The sustained-release tablet should not be broken, crushed, or chewed.

Always follow the dosage prescribed by your doctor.

Benefits of Reactin SR 100mg

• Provides long-lasting pain relief
• Helps reduce inflammation and swelling
• Improves joint mobility and physical function
• Convenient once-daily dosing
• Effective for both acute and chronic pain conditions

Side Effects of Reactin SR 100mg

Like all medications, Reactin SR 100mg may cause side effects.

Common Side Effects

• Nausea
• Indigestion or heartburn
• Stomach discomfort
• Headache
• Dizziness
• Diarrhea or constipation
• Skin rash or itching

Serious Side Effects

• Stomach ulcers or gastrointestinal bleeding
• High blood pressure
• Kidney problems
• Liver damage or elevated liver enzymes
• Increased risk of heart attack or stroke, especially with long-term use
• Severe allergic reactions, including breathing difficulties

Seek immediate medical attention if you experience black stools, severe stomach pain, chest pain, breathing problems, or swelling.

Precautions and Warnings

Gastrointestinal Conditions

Use cautiously in patients with a history of stomach ulcers, acid reflux, or gastrointestinal bleeding.

Heart Disease

Patients with high blood pressure, heart disease, or a history of stroke should use Diclofenac only under medical supervision.

Kidney and Liver Problems

Dose adjustments or monitoring may be required for patients with kidney or liver impairment.

Pregnancy and Breastfeeding

Reactin SR 100mg is generally not recommended during pregnancy, especially during the third trimester, due to possible risks to the baby.

Asthma and Allergies

Patients allergic to Diclofenac, aspirin, or other NSAIDs should avoid this medicine.

Drug Interactions

Diclofenac may interact with several medicines, including:

• Blood thinners (e.g., Warfarin): Increased bleeding risk
• Other NSAIDs or steroids: Higher risk of stomach ulcers and bleeding
• ACE inhibitors and diuretics: Reduced effectiveness and increased kidney risk
• Methotrexate and Lithium: Increased toxicity risk
• Cyclosporine: Greater risk of kidney damage

Always inform your doctor about all medicines and supplements you are taking.

Monitoring

Patients using Reactin SR 100mg for an extended period may require monitoring for:

• Blood pressure
• Kidney function
• Liver function tests
• Signs of stomach bleeding
• Cardiovascular health

Patient Counseling Tips

• Take the medicine exactly as prescribed.
• Consume with food or milk to reduce stomach irritation.
• Avoid excessive alcohol consumption, as it may increase the risk of stomach bleeding.
• Do not take multiple NSAIDs together without medical advice.
• Report symptoms such as severe stomach pain, black stools, chest pain, or breathing difficulty immediately.

Conclusion

Reactin SR 100mg (Diclofenac) is an effective long-acting anti-inflammatory and pain-relief medication widely used for arthritis, musculoskeletal pain, and inflammatory conditions. Its sustained-release formulation offers convenient once-daily dosing and prolonged symptom relief. However, due to potential gastrointestinal, cardiovascular, liver, and kidney risks, it should be used under medical supervision, particularly for long-term treatment. Following the prescribed dosage and regular medical monitoring can help ensure safe and effective use.