most likely yes..
of you give us the name and maker then we can check specifically...
I know that the "sugar free" strepsils ( and regular obviously ) and halls etc all have syn values ( learned that the hard way when I had "man flu" )..
All I can find with regards to manufacturers is that the Robitussin has the same makers as Tixylix. Not much help really. But thanks for that. I only really need it for when I'm in work so the syn value that you have given me should be ok. Many thanks x