Regarding the Botox cycle and resistance, how often do you get it injected?

I had a facial procedure and am reconsidering.

I am asking this question because I heard it is important to maintain an appropriate Botox schedule. Last time, I felt my muscles tensing up again after about four months; is this a reasonable interval for Botox?

Do I need to worry about resistance?

I’ve heard that getting it too often isn’t good, but I’m also worried that if I extend the interval between Botox treatments too long, the effects seem to wear off quickly.

What criteria do hospitals usually use to recommend the Botox injection cycle,

Also, if you have any personal tips for maintaining the effects for a long time, please share them.