Gallamine is a synthetic non-depolarizing neuromuscular blocking agent. It has been used to produce relaxation of skeletal muscle during surgery.

Gallamine triethiodide is a synthetic nondepolarizing blocking drug, which is allosteric antagonist of muscarinic M2 acetylcholine receptor and inhibitor of acetylcholinesterase. It was used under brand name flaxedil to stabilize muscle contractions during surgical procedures. However, this usage was discontinued. It was shown, that gallamine caused tachycardia by depressing the vagus nerve and, occasionally, hypertension and increased cardiac output.