Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Kwok on what is the correct dose for my 12 year old who weighs 113 lbs for zithromax: It depends what it is prescribed for. Azithromycin - my 3 year old son just took all of his med in one dose well this hurt hem? Updated 6 Dec 2012 • 3 answers Azithromycin 250 for 5 days, take 2 tablets 1st day. question is, difficulty with taking large? Azithromycin also comes in several other forms. Learn about side effects, warnings, dosage, and more for azithromycin oral tablet. Learn about side effects, warnings, dosage, and more for. She has an abscessed tooth and is allergic to amoxcillan so the dentist prescribed azithromycin. She s 8 years old and about 60 pounds. It is a five day dose. Zithromax (azithromycin) is an antibiotic commonly used in children to treat bacterial infections, such as ear and sinus infections. Often prescribed in pill form, it can also be delivered in a liquid formulation for children who don't like pills. Detailed Azithromycin dosage information for adults and children. Includes dosages for Bacterial Infection, Sinusitis, Bronchitis and more; plus renal, liver and dialysis adjustments. 1. Total mg per Treatment. 2 DOSAGE AND ADMINISTRATION 2.1 Adult Patients [see Indications and Usage (1.1) and Clinical Pharmacology (12.3)] QT prolongation was reported in a 68-year old woman receiving azithromycin and amiodarone. The patient had a history of stable congestive heart failure and a posterior communicating artery aneurysm. She was receiving amiodarone (200 mg/day) for over a year for paroxysmal atrial fibrillation. Additional medications included furosemide, enalapril, and aspirin. A regular sinus rhythm with normal. Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Ferguson on what is the correct dosing of zithromax for my 12 year old son who weighs 113 pounds: If pills: two 250-mg tablets the first day, then one 250-mg tablet on days 2 - 5 (until med is gone) if liquid: 12.5 ml (use measured dropper) once a day for 5 days. The protein binding of azithromycin in serum is variable and varies, depending on the serum concentration, from 52% at 0.05 mg/l to 12% at 0.5 mg/l. The steady state distribution volume is 31.1 l/kg. The steady state distribution volume is 31.1 l/kg.