How many herbs are included in the Hupei Stem?

Patchouli and Perilla may be a shortened form of Patchouli, Perilla and Platycodonopsis, which includes all three of these herbs.
Pogostemon, has the effects of resolving dampness, stopping vomiting and relieving summer heat. It is used for treating dampness obstructing the middle Jiao (dampness obstructing the functions of the spleen and stomach), vomiting, and the first signs of summer dampness or damp-warmth (warmth caused by feeling dampness and heat). It should not be taken by those who have a deficiency of yin or an excess of fire.
Peilan, with the effects of resolving dampness and relieving summer heat. It is used in treating dampness obstructing the middle Jiao, summer dampness, and the first signs of dampness-warmth. Caution should be exercised if there is deficiency of yin, dryness of blood, or deficiency of qi.
Platycodon grandiflorum has the effects of promoting lung, expelling phlegm, inducing diaphoresis and draining pus. It is used for treating cough with excessive phlegm, chest congestion, sore throat and loss of voice. Excessive use may cause nausea and vomiting.
If there is any discomfort, it is recommended to consult a doctor. If medication is needed, it should be diagnosed by a doctor and regulated according to the doctor’s prescription.