Dissolve Paracetamol in cough syrup

We are asked to make a cough syrup with the following ingredients: Paracetamol 650mg Dextromethorphan HBr 20mg (replaced by diphenhydramine HCl) 12.5 mg Phenylefrine HCl 10mg Syrup 30ml FAC 300ml This is an American green (eucalyptol) cough syrup that we need to namaken. Paracetamol can be solved in alcohol but it strikes down as soon as we add Siropus simplex to it. How can we keep this in solution? The other ingredients do not give any problems.