Campari
Campari is a bitter aperitivo made by Davide Campari-Milano of Italy at 25% ABV, used in 2 drinks on this site.

CC BY-SA 4.0 · Cropped, white-balanced, graded and re-encoded to WebP by eXir.
A bottle of Campari, deep red behind clear glass, with its white and blue label, on a green background
Composition
The red was carmine, a colourant made from insects, until the producer moved to synthetic colourants in the mid-2000s. The European label cached here lists E122, E102 and E133 and no carmine, and the United States bottling uses Red 40; reporting on the change describes it as not having reached every market at once, so which colourant is in a given bottle depends on where it was made.
Producer published figures · camparigroup.info — The producer's own consumer-information page states 25% alc./vol. and, per 1.5 fl oz serving, 108 calories and 11.5 g of carbohydrate; those are restated here per 100 ml. The carbohydrate is taken as sugar because the product carries no other kind. FoodData Central has no record for Campari at all. Cross-checked against the site's own energy arithmetic: 25% alcohol plus 25.9 g of sugar comes to 242 kcal against the 243 the producer publishes, which is what makes the 25% credible - an Open Food Facts entry files the same product at 20%, and at 20% the arithmetic misses by fourteen per cent.
Used in these drinks
most firstSubstitutes
Aperol — Lower in strength and higher in sugar, so a drink built on it comes out longer, sweeter and much less bitter. Widely done, and closer to a different drink than to a substitution.
A general substitute is a browsing aid rather than a drink-specific claim. Where a particular drink has a substitution worth making, it says so on its own page and recomputes the spec for it.