Azith - 2x per day instead of 1x per day?

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My son's doc prescribed Azithromycin once per day. When he first started it

(along with Omnicef) he had incontinence issues, so we stopped it and went back

to Amox. I restarted the Azith a couple weeks after he was back on Amox and had

no issues. Recently, the doc increased the dose of the Azith. and I'm wondering

if it is OK to give it in divided doses (1/2 in AM, 1/2 in PM) instead of once

per day. It seems to me this would avoid a major spike and then a major drop

off toward the end of the 24 hour period. Seems like it would keep a more even

amount in his system, plus I am afraid the major spike might set off

incontinence issues again. Any thoughts?