Algin 2.5 mg/2 ml Injection is an antispasmodic medication containing Tiemonium Methylsulphate, a synthetic quaternary ammonium compound with anticholinergic and musculotropic properties. It works by inhibiting the action of acetylcholine at muscarinic receptors, leading to relaxation of smooth muscles in the gastrointestinal tract, biliary system, urinary bladder, and uterus