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Doctors' Answers to "Frequently Asked Questions" - Cephalexin

These comments are made for the purpose of discussion and should NOT be used as recommendations for or against therapies or other treatments. An individual patient is always advised to consult their own physician.

Cephalexin Usage [posted 11/5/98]
Question: What is Cephalexin taken for? I'm watching two kids that are on it?

Answer: A broad spectrum antibiotic.

Cephalexin Dosage [posted 10/15/98]
Question: How many MG of Cephalexin should I be taking per day for a strep infection(cultured positive) if I weigh 176 lbs?

Answer:Usually 250 mg four times a day would be sufficient. Three times might be ok.

Effect of Cephalexin on Oral Contraceptives [posted 8/4/98]
Question: I was on the antibiotic cephalexin for 10 days. I am also taking ortho tri-cyclen (birth control pills). I started the cephalexin about 2 days before my period ended, which means I started the white pills two days later (after being on cephalexin for 2 days). The doctor told me that it could lower the effectiveness of my pill. Does this also mean that it could cause other problems like breast tenderness, nausea, and cramps? I have been on the pill about a year and all of these signs went away about three months ago. Did the antibiotic have an affect on my pill to increase the cramps and pain associated with taking the pill?

Answer: If there were to be an effect it would only be for the duration of the medication and possibly a week or so afterward. This would not be expected to last 3-4 months. Also, the effect of cephalosporins are usually pretty minimal concerning interactions with birth control pills.

Cephalexin Side Effect [posted 7/30/98]
Question: My daughter has been on different antibiotics for 16 months for mild acne. Two months ago she began having stomach cramping and general off and on abdominal pain. Could this be due to the cephalexin?

Answer: Yes.

Cephalexin [posted 7/21/98]
Question: I have been on antibiotics for a couple years to keep a clear face. My family doctor put me on cephalexin a couple months ago, instead of the antibiotic I was on, because my husband and I are trying to have a baby. Could this medicine be harmful to the baby?

Answer: Probably not.

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