When<unk>  attacks the body, anti-infective drugs can suppress the<unk> . Several broad types of anti-infective drugs exist, depending on the type of organism targeted; they include antibacterial (antibiotic; including antitubercular), antiviral, antifungal and antiparasitic (including antiprotozoal and antihelminthic) agents. Depending on the severity and the type of<unk> , the antibiotic may be given by mouth or by<unk> , or may be applied topically. Severe<unk> s of the brain are usually treated with intravenous antibiotics. Sometimes, multiple antibiotics are used in case there is resistance to<unk>  antibiotic. Antibiotics only work for bacteria and do not affect viruses. Antibiotics work by slowing down the multiplication of bacteria or killing the bacteria. The most common classes of antibiotics used in medicine include penicillin, cephalosporins, aminoglycosides, macrolides, quinolones and tetracyclines. Not all<unk> s require treatment, and for many self-limiting<unk> s the treatment may cause more<unk> de-effects than benefits. Antimicrobial stewardship is the concept that healthcare providers should treat an<unk>  with an antimicrobial that specifically works well for the target pathogen for the shortest amount of time and to only treat when there is a known or highly suspected pathogen that will respond to the medication.
Infection
Sudden infant death syndrome
Disease
Methanol toxicity
Neurotoxicity
Trauma
Side effect
Malignancy