Cilantro, also known as coriander, is an aromatic herb that is regarded as an exterior-resolving agent in Chinese medicine. Other culinary herbs also resolve the exterior, such as basil, scallions, ginger, and mint. Below is a summary of the TCM actions of cilantro:

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English: Cilantro; coriander (in the U.K. the leaves are called coriander whereas in the U.S. the leaves are called typically cilantro and the seeds are called coriander).
Latin Pharmaceutical: Coriandri Herba.
Source: Coriandrum sativum L.
Nature and Flavor: Acrid; warm.
Channel Entry: Lung, stomach.

Cilantro effuses the exterior and outthrusts papules, and is indicated for measles that fail to erupt. It is used for measles due to wind-cold in the exterior, when these manifest with a papular rash that fails to erupt properly, as indicated by papules that appear and disappear. For this purpose, it may be used alone topically, or can be used internally with other medicinals that resolve the exterior and outthrust papules, such as jīng jiè (Schizonepetae Herba) and bò hé (Menthae Herba).

Cilantro also opens the stomach and disperses food. When used fresh as a food flavoring it enhances appetite and digestion.

Dosage: 3–6 g in decoctions. Usually used fresh, but a dried form is also available.

Warning: Contraindicated for papular eruption due to congesting heat toxin.

Sources: Zhong Yao Da Ci Dian, Concise Chinese Materia Medica.