WebMD states that amoxicillin is the first choice to treat acute or recurrent sinus infections, and trimethoprim-sulfamethoxazole is next given to those allergic to amoxicillin. These antibiotics are taken orally or intravenously and remove the bacteria that cause sinus infections. Decongestants, medicines to thin the mucus and inhaled corticosteroids are sometimes also prescribed to remedy sinus drainage.
According to WebMD, conditions should improve within three to five days of taking an antibiotic. If not, a different antibiotic may need to be prescribed. The number of days to take antibiotics for acute sinusitis is decided by the severity of the sinus infection, the patient’s general health and the type of antibiotic prescribed.
Antibiotics are generally safe, but all medicines have the potential for side effects. Breathing trouble and face swelling should be treated as an emergency medical issue, and a doctor needs to be consulted if hives, lightheadedness or fainting occurs when a person is taking an antibiotic for sinusitis. WebMD states that is important to complete the prescription even if the patient feels better so the antibiotics can completely penetrate the mucus inside of the sinuses. If the side effects of the antibiotics do not disappear days after taking the medication, a doctor may choose to lower the dosage or change the medicine.