You should know that the Adams Plus shampoo only treats the problem, it doesn't prevent reinfestations other than keeping eggs from hatching for 4 weeks. (centralparkpaws.net)
You will also have to include in your regimen environmental control and sanitation to help prevent reinfestation. (mypetneedsthat.com)
The Hartz ® UltraGuard Plus ® Flea & Tick Carpet Powder kills fleas for up to 30 days and prevents reinfestation for up to one year. (hartzflea.com)