Answering this needs to know what is already in place, because the marginal value of each step depends on which are missing.
Keep a written log: date, dose, lot, site, and anything noticed. It converts an anecdote into a record and is what makes any later consultation productive.
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.
Start lower and go slower than the label. Time costs nothing here.