What Is Plaster Therapy?

Topical plaster therapy, also known as medicated plaster treatment, is a traditional modality in East Asian medicine—particularly in Traditional Chinese Medicine (TCM)—that involves the application of adhesive, herb-infused plasters directly to the skin over affected areas or specific acupoints. These plasters typically contain a blend of bioactive botanical compounds—including volatile oils, alkaloids, flavonoids, and saponins—derived from herbs such as *Aconitum carmichaelii*, *Angelica dahurica*, *Cinnamomum cassia*, and *Zingiber officinale*. The active ingredients are suspended in a thermoplastic matrix (often composed of rosin, beeswax, and rubber-based adhesives) designed to facilitate sustained transdermal delivery.

Clinically, topical plasters are primarily used for localized musculoskeletal conditions—including osteoarthritis, chronic low back pain, cervical spondylosis, and soft-tissue injuries—where they exert analgesic, anti-inflammatory, and vasodilatory effects. Mechanistically, the plasters promote local microcirculation, inhibit cyclooxygenase (COX) and pro-inflammatory cytokines (e.g., TNF-α, IL-6), and modulate peripheral nociceptor activity. Unlike systemic pharmacotherapies, this approach minimizes gastrointestinal and hepatic exposure while maintaining therapeutic concentrations at the target site.

While generally well tolerated, contraindications include open wounds, severe dermatological conditions (e.g., eczema or psoriasis), known hypersensitivity to constituent herbs or adhesive components, and use during pregnancy—particularly with plasters containing potent vasoactive or uterotonic agents. Evidence from randomized controlled trials supports modest but statistically significant improvements in pain scores and functional mobility compared to placebo, though larger, multicenter studies with standardized formulations are needed to further define efficacy, optimal dosing duration, and long-term safety profiles.