The invention relates to a concentrated oral solution for treating recurrent oral ulcer by type of fire excess from
yin deficiency, which can be used for effectively solving the problems of poor
curative effect, hard healing, long treatment cycle, high
side effect, more impurities, low extract utilization, low content of effective components, poor administration effect and inconvenience in carrying. The oral solution is prepared from
adenophora tetraphylla,
coptis chinensis, salviae miltiorrhizae,
dendrobium, unprocessed
rehmannia root, radix scrophulariae, rhizoma anemarrhenae, yam, fructus forsythiae and radices trichosanthis by the following steps: washing the components, mixing, decocting twice, filtering, concentrating, and combining the filtrates; concentrating to obtain extract, standing, taking supernate, and adding a honey and
cane glucose mixture or a
glycyrrhizin solution or a
stevioside solution; adding
sodium benzoate, boiling to dissolve; adding water, uniformly stirring, refrigerating and centrifugally separating the supernate; and performing
ultrafiltration on the supernate by an
ultrafiltration membrane, encapsulating the ultrafiltrate, and sterilizing. The concentrated oral solution is small in side effects, increased in concentration and content of effective ingredients, small in dosage and convenient to take and carry, and is suitable for patients who cannot decoct decoction or are difficult to take medicines.