Dealing with colds

been injecting for like 6 months. mainly paydirt. some failures. one of my problems is having to take medication. Antihistames and decongestants seem to stay in my system a lot longer then what doctor calculated. He’s say like 2/3 days max. I’m more like 5 days to get out my system. so trimix not working for 5 days. I actually had to increase units to get it to working again. any similar experiences?