UpToDate, electronic clinical resource tool for physicians and patients that provides information on Adult Primary Care and Internal Medicine, Allergy and Immunology, Cardiovascular Medicine, Emergency Medicine, Endocrinology and Diabetes, Family Medicine, Gastroenterology and Hepatology, Hematology, Infectious Diseases, Nephrology and Hypertension, Neurology, Obstetrics, Gynecology, and Women ... a throat swab. A positive result on rapid antigen detec- ... Drug Dose/dosage Duration Recommendation strength, quality ... Cephalexin (Keflex), oral* 20 mg per kg per dose twice daily (maximum ... This is a reivew of how effective Cephalexin (cephalexin) is for Strep throat and for what kind of people. The study is created by eHealthMe from 18 Cephalexin users and is updated continuously. Do you have drug side effects? Oct 12, 2018 · Adults And Pediatric Patients At Least 15 Years Of Age. The usual dose of oral KEFLEX is 250 mg every 6 hours, but a dose of 500 mg every 12 hours may be administered. Treatment is administered for 7 to 14 days. For more severe infections larger doses of oral KEFLEX may be needed, up to 4 grams daily in two to four equally divided doses.