You might be receiving what is called Lenacapavir- something designed to be injected every 6 months.
I receive Apretude injections, which as far as I know, anre administered near the buttocks area every two months. I have only received it twice up until this point.
Each time, I get nausea and diarrhea that lasts a day post injection, as well as soreness and muscular pain around the site of injection for around a week.