| Osteoarthritis is a chronic joint disorder marked by pain, stiffness, and reduced function. Diclofenac, a commonly used NSAID, provides rapid pain relief but is often limited by gastrointestinal, renal, and cardiovascular side effects. Diacerein, which inhibits interleukin-1, offers sustained pain relief with a better safety profile, though its effects take 2–4 weeks to manifest. This review compares the clinical efficacy and safety of Diclofenac and Diacerein, both as monotherapies and in combination, in managing osteoarthritis pain. Diclofenac is effective for immediate symptom relief but carries risks when used long-term, while Diacerein shows potential disease-modifying benefits with fewer adverse effects. The combination of these agents may optimize pain control by allowing lower Diclofenac doses, thereby reducing side effects without compromising overall efficacy. These findings support a personalized treatment strategy that balances immediate pain relief with long-term safety, ultimately improving patient mobility and quality of life.