He has been using this in conjunction with Oxy 10: he thinks increasing dosage will help. He continued with once a day instead of every other day. Is there such a thing as "too much of a good thing" where not following the prescribed dosage actually reverses the benefits?
I assume your son is taking the doxycycline for acne?
He should not increase his dosage without talking to his doctor first.
If his acne is getting worse maybe he needs to try something else eg. isotretinoin.
The change in dosage will not have made his acne worse.
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