My 2 yr old cat wont gain weight

[SanaAura]

Hello, My Cat wont gain weight. In dec 2014 she tested positive for tapeworm so the vet gave her drontal, she has had 2 doses since then and it is now march and she still wont gain weight. I can feel every bone in her body.  I had blood work and everything done and it was normal,  I am really worried because she is only 2 years old.
This weight loss happened almost immediately after my other cat died (he was 28 yrs old )  I dont know what to do.

Diet: blue buffalo wilderness grain free both wet and dry,
pet water filter bowl thing always full and filter changed every 3 weeks
she has playmates who are healthy
shes an indoor kitty,
No fleas, no parasites found

[zodiacqueen]

Opus asked you some great questions! Also, have you had X-rays done? And, is your kitty FIV and feline leukemia negative?

And, if you have more than 1 kitty, I'd watch  her like a hawk to see exactly how much she's eating. A vet can prescribe an appetite stimulant to get her on track.

By the way, WOW 28 yrs old!! That's amazing and shows what a good fur mom/dad you are!!

[opus88]

exactly how much is she eating and what is her current weight? drontol can cause lack of appetite, how close together have the 3 doses of drontol been? In all the blood work was her thyroid level checked?