Is it this one ?
http://www.healthcaremagic.com/drugs...l/836675934401
That's a pretty serious drug for a Paediatrician to prescribe - was your bubs premature or do they have other medical problems ? Actually, I'm fairly amazed that a Paediatrician would prescribe any sort of medication for a 4 week old baby (mine would be more likely to prescribe something for the mother like 'better support' 'less annoying advice' and 'someone to do the housekeeping'...

)
Otherwise, I could make lots of 1:1 suggestions, but 'colic' is very common for a 4 week old baby...my personal experience with my first child (I have three), is that the main cause of her crying was overstimulation/lack of sleep. She was overstimulated from being handed around, taken out and in the car a lot...with our third one we had learnt our lesson and I took him in the car about 6 times in the first 8 weeks, and went out just once each day for a calm walk, and the rest of the time we spent at home in the peace and quiet. We also didn't let anyone hold him much at all, and we kept the routine fairly predictable...although routines do not come easily for me at all!
My husband always says "whoever coined the phrase 'sleeping like a baby' obviously never had kids!"...
Can I suggest that you perhaps try a mothering/parenting/breastfeeding website ?
Personally, for breastfeeding advice/support I recommend this one:
www.breastfeeding.asn.au
For general parenting advice, there are plenty around, of course it can also be complete 'information overload'...
I did find this link and it seems pretty reasonable advice :
http://health.howstuffworks.com/well...-for-colic.htm