My 20yr old hyperthyroid cat does great with a Twist-a-Dose® from Wedgewood pet pharmacy.  
My vet orders the strength of the pens.  
My cat gets 2 twists of the pen twice daily applied in the auricle of the ear.
No fuss, no bother. He doesn’t mind at all.  
So much easier than tablets or other.  
They send 2-3month supply at a time — very timely, not expensive.   I recommend to all - so much easier than fighting with pills.
Ask your vet. He can call it in.   
You can order any time of day and night - don’t even have to talk with anyone—it’s all automated with info programmed in.