Lemsip Cold & Flu Blackcurrant Sachets are for the symptomatic relief of colds and flu including headache, aches and pains, runny nose, high temperature and sore throat. Lemsip Cold & Flu Blackcurrant Sachets - These blackcurrant sachets from Lemsip are a fruity way to treat your cold and flu symptoms. They can be used to treat headaches, fever, blocked nose, sore throats and contains paracetamol for those uncomfortable body aches and pains. Fluids are very important when you are feeling ill so this hot blackcurrant drink also keeps your fluid levels topped up.