Get Virtual Care
For Businesses
About Us
A member asked:
I'm 18 years old and weigh 250 lbs. i am allergic to penicillin but have strep throat. what is the correct dose of cephalexin to be taken?
4 doctors weighed in across 3 answers
Before it is given,: Some people who are penicillin allergic can have cross allergies to cephalosporins like keflex.
Answered 1/16/2015
5.4k views
See below: The dose can vary. The frequency of dosing can vary. I would probably treat with 1500 or 2000 milligrams twice a day. But again the dose and frequency varies. Some will give this medication 3 times a day. Hope he gets better.
Answered 1/16/2015
5.4k views
Take erythromycin: Some penicillin-allergic persons are also allergic to cephalosporins like cephalexin. Its safer to take a macrolide drug like erythromycin, biaxin (clarithromycin) or zithromax.
Answered 1/16/2015
5.4k views
Related Questions
A member asked:
I have strep throat and started taking Biaxin (clarithromycin) yesterday. I took this many times in the past because I'm allergic to penicillin. Will it help again?
A doctor has provided 1 answer
A member asked:
I had strep throat and was put on penicillin for 10 days and finished my last dose a week ago and still have a lesser degree sore throat, i'm concerne?
A doctor has provided 1 answer
A member asked:
Can I use Flagyl to treat strep throat? I'm allergic to penicillin, bactrum, ceftin (cefuroxime) and levaqon.
5 doctors weighed in across 3 answers
A member asked:
I want to know if Levaquin treats strep throat or bacterial pharyngitis since I'm allergic to penicillin and resistant to biaxin (clarithromycin)?.
A doctor has provided 1 answer
A member asked:
My 5 yr old has now had 4 course of penicillin for a recurring sore throat/ strep. Looks like his coming down with it again. Anymore explications?
A doctor has provided 1 answer
People also searched for:
My 5 year old was given a prescription of 2 1/2 teaspoons of cephalexin 2 times a day for strep throat for 10 days. Sound right i feel this is too much. Is that correct dosage?
Yesterday, I went to the er for my infected tounge piercing, I took it out and tested positive for strep.They gave me a penicillin shot.Today I have fever, congestion and a bad cough.Should I go back to the er?Also, i have cephalexin 500mg in my home?
What dose of clindamycin is used to treat strep throat for penicillin allergic PTs? Dose per day in mgs?
My 20 year old daughter has sore throat, swollen lymph nodes and UTI symptoms. Throat culture showed Strep B. Dr gave Keflex- is it necessary?
I have strep throat, i received a shot of penicillin for it. By Dec 31 it will have been 2 full days since injection. Can i drink on New Years Eve?
Didn't find what you're looking for?
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your questionMore of what we treat
Download HealthTap
Video visit and message your doctor
