Cefaclor, which was patented in 1973, is an antibiotic indicated for the treatment of many different types of infections caused by bacteria “such as pneumonia and infections of the ear, lung, skin, throat, and urinary tract” (Wikipedia.com). Basically, this antibiotic works by hindering the growth of bacteria that cause the aforementioned infections. Remember that you must tell your doctor if you are allergic to any drugs, especially penicillin, before taking Cefaclor. According to drugs.com, “antibiotic medicines can cause diarrhea, which may be a sign of a new infection.” So, if after using Cefaclor, you start having diarrhea that has blood in it, call your doctor immediately. As for the other side effects that can occur, they include fever, swelling in hands or feet, shortness of breath, and chest pain. Of course, you’ll need to contact your doctor as soon as you have any of these side effects. There are, however, other side effects that are fortunately less serious such as vaginal itching, mild nausea, constipation, and loss of appetite. Even though Cefaclor is not expected to harm an unborn baby, consulting a doctor before using it is recommended in case you are pregnant or plan a pregnancy. You also need to tell your doctor if you are breastfeeding before taking this antibiotic, because it does pass into breast milk, and it could actually harm a nursing baby. It is worth noting that Cefaclor may be taken with or without food. You should, however, take it with food if stomach upset occurs.