5-fluorouracil + botulinum toxin A + dexamethasone + triamcinolone

This is a combination therapy consisting of four active pharmaceutical ingredients: - **5-fluorouracil** is an antimetabolite and pyrimidine analog that inhibits thymidylate synthase, interfering with DNA synthesis and used primarily as an antineoplastic agent. - **Botulinum toxin A** (onabotulinumtoxinA) is a neurotoxic protein that blocks acetylcholine release at neuromuscular junctions, resulting in muscle relaxation or paralysis. It is used for various indications including spasticity, chronic migraine, dystonia, hyperhidrosis, and cosmetic applications[1][2][3][4][5]. - **Dexamethasone** is a synthetic glucocorticoid corticosteroid with potent anti-inflammatory and immunosuppressant properties. - **Triamcinolone** is also a synthetic glucocorticoid corticosteroid used for its anti-inflammatory effects. This specific four-drug combination does not correspond to any single approved branded product but may be compounded or studied for off-label use in certain clinical settings where synergistic effects are desired (e.g., local injection protocols for keloids or hypertrophic scars). Each component has distinct mechanisms of action targeting cell proliferation (5-fluorouracil), neuromuscular transmission (botulinum toxin A), and inflammation/immune response (dexamethasone, triamcinolone).