galantamine : Information on Uses, Dosage & Side Effects on Healthline.com Reminyl, Galantamine Hydrobromide ER, Razadyne, Razadyne ER, Galantamine HydrobromideGalantamine improves the function of nerve cells in the brain. It works by preventing the breakdown of a chemical called acetylcholine (ah see til KO leen). People with dementia usually have lower levels of this chemical, which is important for the processes of memory, thinking, and reasoning.