SN instructed patient / caregiver that Guaifenesin is an expectorant used to help clear mucous and congestion and codeine is used to quiet to cough. SN instructed patient / caregiver to take as directed and with food if stomach upset occurs. Informed that drowsiness, constipation, stomach upset, nausea, vomiting, dizziness or headache may occur the first several days the body adjusts to the medication, call physician ( MD ) if these effects continue or become bothersome or if developing skin rash, itching or rapid heart rate. SN instructed patient / caregiver to take the needed cough medication and stop when symptoms clear up.