Answering this needs to know what is already in place, because the marginal value of each step depends on which are missing.
Have a plan for stopping before you start, including what you would do with the remaining material and how you would tell someone what you had taken.
Know the symptoms that end the discussion: severe epigastric pain radiating to the back, persistent vomiting with reduced urine output, spreading redness with fever, jaundice, chest pain or breathlessness.
The symptom patterns listed above correspond to recognised emergencies with defined presentations, which is why recognition rather than management is the useful skill.
Nothing here is medical advice, and research-use compounds are not approved for human use in any jurisdiction.
Learn the handful of symptoms that end the discussion and start a clinical one.