I used Advantage II on Feeby on 8/6, and she will get her second round today. We also used Adams Flea & Tick Spray, which contains IGR, on carpeting and furniture - and, vacuumed, of course. It has only been in the past week that we think we have finally made headway. The spray smells to high heaven (like alcohol) when first applied, but dries pretty quickly and there is no after smell. However, I only use it in areas when Feeby is elsewhere in the house.I saw in your previous posts you've been using DE to combat the flea issue. How often would you dust Krista with the DE?
We're currently going this route until we can possibly afford spot-on treatments soon for both cats + dog, although they had Frontline back on August 15th (which didn't seem to work). Today's another day of vacuuming for sure!
The IGR is, IMO, a necessary and an effective supplement to the topical flea treatment, as it helps to kill larvae/eggs that drop off the cat/dog and into carpeting, furniture, and other flooring. This is key in getting the fleas under control faster.
So, it might not be that Frontline isn't working, it just takes some time to start getting results, and I think adding an IGR is crucial.
Here is a web site that contains a lot of information, including about IGRs and some recommended products. This web site also suggests it can take up to, if not more, than 2 months to end an infestation.
FleaScience