Hi thanks for asking question.... You are having sore throat ... So posterior pharyngitis could be there .... Here yes you can take cold medicine as the course of phenetermine completed .... You can take decongestant tablet like antihistaminic drug course ...ex..benadryl .. If inflammatory swelling more short term steroid can be used. ... Salt water gargles done ... Avoid smoking .... Drink more water ... Green leafy vegetable more .... Excess spicy avoided .... If symptoms increasing antibiotic needed . Consult physician for examination... Take care ...