What Causes False Positive Result For Penicillin While On Doxycycline?

Posted on Thu, 21 Jan 2016

Question: I have taking amoxicillan all of my life , especially since I have a heart murmur before I see a dentist. usually dose of 500 mg per pill. about a few weeks ago I saw that my physical to allergen test via blood and it shows I have a level 1 allergy to penicillin. I am shocked , and wanted to know could these results be false as I always take amoxicillan and have no reaction. I am afraid if I have to take antibiotics to take it now... however I did have a very bad reaction to doxycyline

Answered by Dr. Drkaushal85 (36 minutes later)

Brief Answer:
No need to worry for this result.

Detailed Answer:
Thanks for your question on Health Care Magic.
I can understand your concern.
No need to worry for this positive allergy report.
Sometimes false positive results are common in patients with allergy to other drugs.
For example, you are having reaction to doxycyclin, so it is likely that you are allergic to doxycyclin.
And this causes false positive result for penicillin.
You have taken amoxicillin for number of times without any reaction. So no need to worry for false positive penicillin allergy test.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.

Note: For further information on diet changes to reduce allergy symptoms or to boost your immunity, Ask here.

Above answer was peer-reviewed by : Dr. Vaishalee Punj