Brief Answer:
Keflex when taken with metformin can reduce blood sugar to below normal

Detailed Answer:
Hi XXXX,
Thanks for writing in to us.

I have read through your query in detail.
Please find my observations below.

1. Keflex (cephalexin) might interact with metformin and lower the blood sugar levels below normal.

2. Therefore please talk to your doctor and be aware because you might require dose adjustment of metformin and monitor your blood sugar level to make sure it is in the normal range.

3. Similarly glipizide interacts with Zoloft (sertraline) and lowers the blood sugar level.

4. Omeprazole also increases the level of simvastatin and increases the effects of simvastatin.

5. Please discuss your medications with your doctor and get dose adjustments made where required to avoid side effects.

Hope this answers your question. Please feel free to correct any oversight in my interpretation of your problems and discuss them in detail as per your requirements.

Hope your query is answered.
Do write back if you have any doubts.

Regards,
Dr.Vivek

---