No way of knowing. Absorption of food depends on lots of factors.
But all things considered, what happened happened and the risk of repeating the whole course of medication may be greater than the small chance that it's efficacy was compromised. Remember, even a full course on an empty stomach is less than 100% effective.
See what your doctor says.
San Francisco Area
ESR'd March 2010. FIRE'd January 2011.
As if you didn't know..If the above message contains medical content, it's NOT intended as advice, and may not be accurate, applicable or sufficient. Don't rely on it for any purpose. Consult your own doctor for all medical advice.