Subarachnoid Hemorrhage Recovery And Galantamine

Inclusion Criteria: * Spontaneous subarachnoid hemorrhage * Presentation to hospital within 72 hours of symptoms * Fisher grade 3 hemorrhage (thick subarachnoid clot) on initial computed tomography (CT) scan * Hunt and Hess grade 1-5 at time of randomization * Presence of a cerebral aneurysm on computed tomographic angiography (CTA) or Angiogram for which clipping or coiling is possible * Ability to obtain medication within 36 hours of presentation Exclusion Criteria: * subarachnoid hemorrhage (SAH) due to causes other than aneurysm rupture (trauma, arteriovenous malformation (AVM), mycotic aneurysms, Moyamoya) * Pre-existing disability with modified Rankin Scale (mRS) score ≥2, * Renal disease as defined by creatinine clearance less than 9 milliliters/min * History of severe hepatic impairment (Child-Pugh score of 10-15) * History of chronic obstructive pulmonary disease (COPD) or asthma * History of dementia * Co-morbid conditions likely to complicate therapy, including clinically significant arrhythmia, acquired immune deficiency syndrome (AIDS), autoimmune disease, malignancy, and expected mortality within 72 hours * Expected mortality within 72 hours as determined by PI, treating neurointensivist and neurosurgeon. (Clinically manifested by no attempt at securing aneurysm) * Females who are pregnant.