Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Ferguson on amoxicillin 500mg chest infection: It depends on what is causing the infection and if it is bacterial if the bacteria is sensitive or resistant to the amoxicillin. Anyway, I'm feeling generaly better in many ways, but GP said my chest sounded 'bronchitic' and prescribed ABs. I'm not sure how long they take to work, but would have thought 72 hours would have been long enough but my chest is still wheezing/rattling and painful on one side. Buy how long does amoxicillin 500 mg take to work on chest infection Antibiotics won't help your doctor if i being impatient? Does it important for how many days. A chest infection affects the lungs or your airways. An infection of the lungs or large airways is known as a chest infection. If the infection affects the larger airways, it is known as bronchitis, and if it affects the smaller air sacs, it is known as pneumonia. The next time you develop a lower respiratory tract infection, don't expect amoxicillin, the go-to antibiotic for these infections, to wipe it out. Amoxicillin works by interfering with the bacteria that cause the infection. Amoxicillin can treat a wide range of infections including those of the following: chest (bronchitis or pneumonia) Amoxicillin is given to treat a bacterial infection. It is mainly prescribed for sinus and chest infections , urine infections , ear infections , and some dental infections. You may also be prescribed it to prevent an infection from occurring if you are at particular risk of getting an infection. A chest infection is an infection of the lungs or large airways. Some chest infections are mild and clear up on their own, but others can be severe and life threatening. Some chest infections are mild and clear up on their own, but others can be severe and life threatening. Amoxicillin is an antibiotic. It's used to treat bacterial infections, such as chest infections (including pneumonia), dental abscesses and urinary tract infections (UTIs). How long does it take doxycycline to work topics medschat. I had chest infection at xmas two lots antibiotics the gp said sounded clear im still off work but starting to feel better and try push.