The beverage comprises carbonated water, sugar, lemon juice from concentrate (2%), citric acid, flavourings, acidity regulator (sodium citrate), sweeteners (aspartame, sodium saccharin), preservative (potassium sorbate), and antioxidant (ascorbic acid). ​

Schweppes Lemonade is free from the 14 major allergens, including gluten, dairy, nuts, soy, and sulphites, making it suitable for individuals with common food allergies. The beverage contains sweeteners, including aspartame and sodium saccharin. Individuals with phenylketonuria (PKU) should be aware that the product contains aspartame, which is a source of phenylalanine. Once opened, store in a cool and dry place and consume within a reasonable time to maintain freshness.