The purpose of an antihistamine is to work against the effects of histamine, a chemical substance found in nearly all body tissues. Histamine is released in response to injury or invasion by foreign substances such as pollens (see allergy). It is also the irritating agent in certain insect venoms.
Metronidazole for a Strep B Infection. Group B Strep is a strain of the streptococcus bacteria that can cause serious illness and is potentially life threatening, especially in newborns, pregnant women, elderly patients, or anyone with any already compromised immune system.
Nonprescription medicines that relieve pain may help relieve some symptoms of strep throat, but they will not make you better any faster. Be safe with medicines. Read and follow all instructions on the label. 1  Acetaminophen or ibuprofen, for example, can help relieve throat pain and reduce fever.