Antibiotics stay in a person's bloodstream for different periods of time depending on the antibiotic used, so consulting a doctor is the best bet, according to the NHS. Antibiotics are drugs that enter the bloodstream to treat everything from mild problems such as acne or a fungus to severe problems such as pneumonia, says the NHS.
NHS states that antibiotics can only be used to treat bacterial infections and are unable to help with other infections or problems such as the common cold, the flu, runny noses or ear infections. With antibiotics, it is important to always take the full course of antibiotics that has been prescribed. If a person stops taking an antibiotic then the bacteria might become antibiotic resistant. This is a problem, as the new resistant bacteria becomes stronger and more resistant as it continues to grow, infecting new people.
Antibiotics are taken by following the directions on the box or the doctor's take-home sheet. Antibiotics come in three forms: oral, topical and injection form. The oral form typically involves liquids, pills, capsules or tablets while the topical covers everything from lotion and creams to drops and sprays. The injections are only given for serious problems and can be injected directly into the muscle or the blood.