Baby aspirin interaction with horse chestnut?

There is a moderate interaction, meaning:

Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.

Interactions between your drugs
Moderate
aspirin horse chestnut
Applies to: Aspir 81 (aspirin), horse chestnut

Talk to your doctor before using horse chestnut together with aspirin. Combining these medications may increase the risk of bleeding. You may need a dose adjustment or more frequent monitoring by your doctor to safely use both medications. You should seek immediate medical attention if you experience any unusual bleeding or bruising, or have other signs and symptoms of bleeding such as dizziness; lightheadedness; red or black, tarry stools; coughing up or vomiting fresh or dried blood that looks like coffee grounds; severe headache; and weakness. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

Source:
https://www.drugs.com/interactions-check.php?drug_list=243-13622,1249-0