Yeh, the pseudoephedrine should be no probs. Most C+F pills contain 30mg of psedoephedrine, so 6x 30mg = 180mg. It wont become neurotoxic until you exceed a dosage of around 300mg. I have had 280mg and found the experience insanely intense, but pleasurable... in a heart pounding, teeth clenching, sweating, paranoid, stomach cramping kind of way.
However this was relatively pure pseudoephedrine, not cold and flu pills. C+F pills contain paracetamol which is an extremely toxic compound. It eventually causes your organs to shut down but will not usually show symptoms of poisoning until it is way too late.
Drink plenety of water so that ur body can flush out the metabolites. 6 pills really wont do shit, so u should be ok... just enjoy the nice buzz while it lasts and i'd recomend that u follow the directions on the label next time.
If u want to get off ur chops on pseudo's the extraction is a simple process but i shant go into that here...