I know the law changed in March to say children under 6 shouldn't be given Medised.
When DS was small, it was marketed as suitable for 3mo and upwards, which then changed to 2yo, and now to 6yo.
DS has had it occasionally when blocked up and coldy, which led to difficulty breathing during sleep - in fact, since he was a few months old (in line with recommendations then).
He has a horrible cold at the moment, bunged up, can't breath and it's affecting his sleep. Last night he woke about every hour through the night.
I've googled, found this "Products with old labelling that give doses for children under six won't be immediately withdrawn from sale, because there are no immediate safety issues with them and they have been in wide use for decades" and so am considering giving him a dose tonight.
No, YANBU, I think the law was changed as people in America were giving much higher doese than they should. I still use it from time to time, my HV has said OK to use in cold situations (as you are planning to do), just stick to the dosage recommendations.
I wouldn't give it to mine now. You don't know for sure that formulation hasn't changed now and it contains other things that are only suitable for over 6 year olds. A pharmacist wouldn't recommend it and they know better than me about such stuff.
What's wrong with calpol and a better decongestant? We use those plug in things and always worked a treat.