I'm sure there will be a lot of good feedback on this one but here is my 2 cents based on my expereince. There are two issues here: The antibiotics and the illness. Both will exert an effect. I think you have to be cured and have all the antibiotics out of your system before you start going hard again. Don't worry too much about "losing momentum". People get sick, it's a fact of life. You'll bounce back. My advice (FWIW) is to go very, very easy- take it slow. Don't sweat it.

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Tom Demerly
The Tri Shop.com

I have a cold for more than a week. In the last days I also got a nasty cough.

Now I ask myself if I should should train or stop for some days. Sometimes I am simply to tired to train. But other times I fell better and I want to train. When I think it over it is probably better not to go out and breath in cold air.

How would you handle this?

Finally my cold got worse. I stayed at home for one day. Now I am back at work. But I don't feel fit and wait some more days until I start training again. I will start easy and ramp it up to pre-illness volume.
I needed anyway a recovery week (planned it for next week).

Don't train to soon to hard/long. Better to take it too easy than to become again ill.

Felix

I suffer from sinus infections often I have a bent nose. I just got off antibiotics last week. I noticed that during the course of the infection and the antibiotics my resting heart rate is up. I do notice that exercise helps the sinus and nasal passages to flow. I blow alot of snot missiles while training. I have talked to my doctor about training during these times and basically he said to use common sense, listen to your body. I am base training right now so the intensity of my training is low. I check my resting heart rate each morning while fighting a sinus infection and adjust my training accordingly. During a hard training phase I may alter significantly what I do. Hope this helps.

I was just reading, (in the triathletes bible) that for every day sick, you should take 2 days of easy recovery work. I know that I just made that mistake by getting sick last monday, taking most of the week off, racing on saturday, and then because I felt fine, did some nice hard intense swim workouts on sunday and monday. Guess what? tuesday, I was sick as ever. So, listen to your body, and take in easy for at least a week after the last symptoms dissapear. Then I would re-evaluate where you are, and start the build period again.

David