Catnip, an herb related to mint, is known for the affection cats display for it. However, humans also have used catnip for over 2,000 years. 1. Make a catnip tea by steeping several teaspoons of dried catnip leaves and flower  stalks in a cup of boiling water. The tea will have a strong minty flavor. 2. Try catnip tea as a digestive aid and mild sedative. Catnip can be used as a carminative, which aids digestive cramps. Catnip tea also has use as a sedative and can be consumed in the late evening hours to aid digestion after large meals and sleep.