Buying nursing solutions in pharmacies can make it easier to choose products that suit you, and at the same time, you can get professional advice and guidance. Most of the nursing solutions sold by pharmacies come from formal channels, which are guaranteed by brands and manufacturers to ensure the quality and safety of products. Contact lens liquid medicine has the lowest production cost and the largest overall profit. The production cost is the price of the package, and the liquid medicine inside is not much more expensive than normal saline.