I'm caregiver to a 77yr old female with alzheimer's. her doctor said she's could have robitussin (guaifenesin) daily for a long term cough. can it be taken long-ter?

Consider this: Although Robitussin (guaifenesin) is an otc preparation and relatively safe, patients with alzheimer's may experience exquisite sensitivity to the anti-cholinergic side effects from most medicines. This could create worsening memory, and even promote a delirium or agitation. So, watch this lady with care, and confer with the doctor if problems emerge.