CAN I TAKE BENADRYL 2 DAYS BEFORE PT TEST AND 1 WEEK PRE OP

I HAVE COME DOWN WITH THE FLU AND I AM SUPPOSE TO GET A PT AND PTT BLOOD WORK DONE IN 2 DAY AND MY SURGERY DATE IS IN 1 WEEK AND THREE DAYS.IS BENADRYL ALLERGY AND SINUS HEADACHE O.K TO TAKE, ITS THE WEEKEND NOW AND I CAN'T REACH MY DR. OFFICE. I THINK IT HAS ACETAMINOPHEN IN IT ALONG WITH ANTIHISTAMINE, NASEL DECONGESTANT , PAIN RELIEVER IT SAYS ON THE FRONT OF THE BOX. I HAVE 103 FEVER ON AND OFF AND THE CHILLS, SINUS HEADACHE, COUGH, SNEEZING, MUSCLE WEEKNESS, I AM PRETTY SURE ITS THE FULL BLOWN FLU.........

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