Hi Marc
totally can't see how they would, could or should. Check the list of ingredients such as the other components and look for them.... or just test and adjust dose if required
I don't know much about your diet, but I eat oats a lot ... its actually good for you and there may be some effect on your cholesterol too.
I usually start the day with a bowl of simple boiled oats
I shun the packet "Instant Oats" as they have stuff in them like sweeteners. I have mine relatively plain with a dallop of my own recipe Rasberry Jam:
(which follows more closely the Finnish "Hillo" style.
and occasionally make meals of oats too (not so frequently). For instance:
One of my favorites: savoury oats
Ingredients: chopped leek, salami, sesame oil, chilli flakes, oats, water.
Fry the chilli and leek in the oil for a bit, toss in the salami. Mix a wet slurry of Oates and pour that in. Cover and reduce heat / flame to minimum. 5 minutes later whack on the plate
I have another few variations of this including using white fish and sesame oil
There are plenty of sources of fibre that are just good healthy eating. I don't know anything about your diet, but if you aren't getting enough naturally you may just wish to try a change in how cook and what you eat. Such things may be enough to satisfy your Dr and you can avoid the "metamucil" stuff.
Sorry to hear about your "silver snake" episode.