1. Acetaminophen [uh-see-tuh-min-uh-fuhn] (also known as Paracetamol in UK and Canada) is contraindicated for amounts over 1,000 mg over the course of 6 hours while using the G6. The length of time that acetaminophen (paracetamol) affects the system's performance is based on dosage and length of time since dose.