FORMULATION AND EVALUATION OF PULSATILE TABLET OF DICLOFENAC SODIUM FOR MORNING STIFFNESS IN RHEUMATOID ARTHRITIS

*Prathamesh Manepatil, Kuldeep Hemraj Ramteke, Soham Lokre, Tejas Patil

ABSTRACT

Background: Rheumatoid arthritis (RA) is a chronic, systemic autoimmune inflammatory disorder that exhibits distinct circadian rhythm-dependent symptom patterns. The hallmark symptom of morning stiffness, which peaks between 2:00 AM and 8:00 AM, is driven by the nocturnal surge of pro-inflammatory cytokines such as interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-α). Conventional oral dosage forms of anti-inflammatory drugs fail to synchronize drug release with this biological rhythm, resulting in suboptimal therapeutic outcomes and unnecessary systemic drug exposure throughout the day. Objective: This review critically evaluates the formulation strategies, excipient selection, evaluation methodologies, and chronotherapeutic rationale for pulsatile drug delivery systems incorporating Diclofenac Sodium, a widely used non-steroidal anti-inflammatory drug (NSAID), for the management of RA-associated morning stiffness. Key Findings: Pulsatile tablets, particularly compression-coated systems, demonstrate programmable lag times of 4–6 hours followed by rapid burst drug release, enabling pre-dawn drug absorption that coincides with peak symptom onset. The strategic use of hydrophilic and hydrophobic polymers such as HPMC, Ethyl cellulose, and Eudragit L100-55 has been shown to precisely control the lag phase. Clinical and in vitro studies confirm significantly improved pain relief indices, patient compliance, and reduced gastrointestinal adverse effects compared to conventional formulations. Conclusion: Pulsatile drug delivery represents a scientifically advanced and clinically meaningful approach to chronotherapeutic management of rheumatoid arthritis. Future research integrating smart polymers, 3D printing, and artificial intelligence-assisted formulation design holds great promise for personalized chronopharmaceutical treatment.

Keywords: Pulsatile drug delivery system • Diclofenac Sodium • Rheumatoid arthritis • Morning stiffness • Chronotherapy • Controlled release • Compression coating • Circadian rhythm • HPMC • Eudragit.