Can you use other flea medications while using sentinel?

my vet gave my miniature dachshund sentinel tablets to take for fleas, heartworms, etc. but every summer, she is COVERED in fleas. She has a flea allergy, so the poor thing has red bumps all over her tummy and is scratching until they bleed. I'm also using a cheap flea collar and cheap flea medicine from walmart. but i was wondering if she could take any other flea medicines like advantix or anything else with sentinel so she doesnt have so many fleas