Is it okay to reach second plateau with mucinex?

I, at 140lbs, would need 13 30mg pills to reach the second plateau but I'm not sure if the other active ingredients would be too much for that. Atm this is what I have so I'm wondering if 13 pills would be "safe" to take and if so, what would theoretically be the maximum amount of mucinex you could take "safely," like could I reach the third plateau with mucinex?