You can take four boxes of capsules on the plane. Specifically, if capsules are not illegal drugs, and the quantity does not exceed the number stipulated by airlines, then they can be taken on the plane. Different airlines may have different regulations. It is recommended to consult a specific airline before departure to ensure compliance with its regulations. In addition, if you need to carry liquid medicine, each piece shall not exceed 100 ml. If you need to take the plane, you need a hospital certificate, prescription certificate, etc. If you plan to take capsules abroad, you need to pay attention to the regulations of the destination country on imported drugs. For example, some countries may have restrictions on certain drugs, and it is necessary to apply for permission in advance or provide a doctor's prescription certificate. Description of capsules: The drugs in capsules are generally powders or particles that are irritating to esophagus and gastric mucosa, or drugs that have bad taste, are volatile, are easily decomposed by saliva in the mouth, and are easily inhaled into trachea. These drugs are packed into capsules, which not only protect the medicinal properties of the drugs from being destroyed, but also protect the digestive organs and respiratory tract. Removal of capsule shell may lead to drug loss, drug waste and reduced curative effect.