Difference in lemsip products.

Chances are they have different pharmacokinetics based on the vehicle (tablet). They're probably absorbed at different rates / in different places in the body. Just off the top of my head I'd say the "nasal" directed ones would more likely be absorbed nearer the mouth, whereas the full body flu tablets would be absorbed in the intestines to allow a more systemic distribution.

I'm tired this may be rubbish but it makes sense to me :p

And you'll probably find the more expensive painkillers also include ingredients like caffeine which aid the absorption / action of the painkiller itself, giving you quicker relief.
 
Thats why I usually make my own.

1 x 500mg Paracetomol tablet.....8p
1 x spoonful of sugar........2p
1 x squeeze of Lemon juice.....3p
Hot water & teapsoon of honey..2p

Sometimes a can of coke afterwards (for the caffeine).

Roughly the same thing & much more controlled.

Anyone that buys cough medicine or modern cold cures needs their head seen too (no pun);)
Tesco have a cough syrup for 96p for a massive bottle. So that works out cheaper than your pricing. So I don't need my head examined. :p
 
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