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Strong antibiotics also kill the friendly bacteria normally inhabiting in the colon as well. That can lead to opportunistic infections of the colon sometimes.
Also vitamid K and B12 synthesis may be affected.
Bloating, diarrhea may be experienced due to the loss of friendly bacteria.
Probiotics containing lactobacilli, bifidobacterium are recommended daily to replace the normal intestinal flora.
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Vitamin B12 is made in your intestine by friendly bacteria and so is vitamin K.
Their deficiency can cause symptoms.
You can take them as supplement.
But if no other symptoms, you do not need to worry.