If I use 3 tablets of Gripex and 2 sachets of Grinovity forte per day for 3 days, does it weaken the effect of the tablets

If you do not exceed 3000 mg of paracetamol per day (please check on the packaging how much mg of paracetamol 1 tablet of Gripex has, because I do not know which type you are taking exactly), then the contraceptive effect of Dionelle is preserved. Vitamin C used at a dose above 1000 mg (2 sachets of Grinovity Forte contain 1700 mg of vitamin C) can change the absorption and concentration of ethinyl estradiol and make the cycle irregular. It is worth emphasizing, however, that the data on this subject are few, debatable and ambiguous, but due to the fact that the leaflets of some contraceptive drugs contain such warnings, the effect of vitamin C on contraception cannot be completely excluded, therefore, during intercourse over the next 7 days, a condom can be used. I am attaching a study that may be helpful: https://www.gdziepolek.pl/artykuly/jakie-leki-oslabiaja-skutecznosc-antykoncepcji