canninball3 said:
Knowing your current Tirz dose in mg would be useful.
Also, going fully over to Reta alone isn't something I'd suggest. When it comes to appetite suppression, Tirz is far stronger than Reta. Quite a few members here combine Reta with Tirz. My own stack is 6mg of Reta plus 1mg of Cag, and if I drop the Cag, the Reta barely blunts my appetite, even though I inject twice weekly. (Split dosing)
The standard Reta schedule starts at 2mg, then 4mg, 8mg, and tops out at 12mg.
You can go below 2mg, like .5mg or 1mg each week, and that did work for me for a stretch and made the sides easier while I was titrating up.
It'd be worth searching these forums for how others run Reta and Tirz (unless someone else comments here).
Still, if you simply move from Tirz to Reta, chances are you'll end up going back to Tirz. Honestly, once I hit my goal body weight I'll likely move to Tirz for maintenance.
But I wouldn't make a cold turkey switch, particularly when you're bringing in another receptor. Perhaps try adding .5mg of Reta to see how you tolerate it, and consider tapering the Tirz down if you're on the higher doses?