There appears to be inconsistency. Some products report 'sugar free', some 'contains sucrose'. No mention of artificial sweeteners, but I reckon there probably is.
Wockardt version says 1.5g/5ml. A pharmacist is really good at rooting these things out. The formulary has definitely changed over the years, and I find it to be a bitter, distasteful taste currently. The version I had last year reports 'contains sucrose' certainly never affected or spiked my blood sugars.
Edit: artificial sweeteners.