Yes, according to current information, it is not contraindicated to use chamomile tea in combination with citalopram for better sleep. However, it is important to be cautious when combining citalopram with medications that can irritate the stomach lining, as there may be an increased risk of gastric bleeding. Chamomile may have anticoagulant properties, potentially prolonging the time it takes for bleeding to stop. Therefore, if you regularly take medications like anti-inflammatories, it's important to be mindful of this potential risk.