Hi - I wouldn't be too scared of the amox. I'd think if it were to have a negative impact on tics, you'd notice pretty quickly. For a positive impact (in the event of PANDAS), it could help right away or it could take longer. My child just turned 5 and has been taking Augmentin (which is Amox + another antibiotic) for 2 months now for suspected PANDAS. It wasn't until the 5th week that we noticed a huge improvement, and I'm still not sure if the improvement can be attributed to the Augmentin or to natural waxing/waning or to other things we are also doing (vitamins, supplements, diet, etc.). Anyway, good luck & keep us posted on how everything goes.