Fish Oil or Multivitamin should be taken once a day hrs later then you take Paracetamol (subject to when needed) Or you can have Paracetamol first then hours later will be Fish Oil or Multivitamin. As long as Fish Oil or Multivitamins are taken in the morning it should be fine.
I honestly did that few times cause i was sick 😅 but i think not recommended. Try to gap them few hrs.