Guiatuss, organidin nr, robitussin, (guaifenesin) which is better?

Mucinex (guaifenesin): Mucinex (guaifenesin) does not need to be taken as often as Robitussin both contain guaifinesen. If you have a cough, make sure to get a DM formulation that has a cough suppressant in it, dextromethorphan. Beware that some formulations have a decongestant, good if you have a stuffy nose, but can keep you up at night. Try to take a cough suppressant/guaifenesen to loosen secretions at night. See MD for Rx option