Liquid acetaminophen used to be sold as an infant’s product and a children’s product.
The infant acetaminophen was very concentrated (80mg in 0.8 ml) and was dosed by the milliliter with a little dropper.
The children’s acetaminophen (160 mg/5ml) was dosed by the parents in the US by the teaspoon (1 tsp=5 ml).
The infant product was eliminated over concerns that parents could confuse the two products and possibly give their child too much.
All liquid acetaminophen sold for infants and children is now 160mg/5 ml.
Pricing varies with the product sold for infants sometimes costing more than the product sold for children. They are both the same concentration (160mg/5 ml), and they are interchangeable as long as you use the right dose and the right measuring device.
Check your dose with your pediatrician and check the price at your local store.