Hi,

No good, having a headcold! Hope you are tucked up in bed now. As some-one pointed out, the medication may have a drying effect on your milk. Not desirable if you are concerned about your milk supply. But maybe not so much of a concern if you have a plentiful supply. You probably need to do your own little risk/benefit analysis. The medication itself is regarded as safe for mothers to take whilst breastfeeding - no effects on the baby noted.
Warm regards
Barb