Tonsillitis is inflammation of the tonsils, pharyngitis is caused by inflammation of the pharynx, which is in the back of the throat, between the tonsils and the voicebox (larynx). Tonsilitis and pharyngitis can be caused by a bacterial or viral infection. Below you may find medications used to treat or help with Tonsillitis/Pharyngitis. More about Tonsillitis/Pharyngitis