Corydalis Formula (Shao Yao Gan Cao Jia Yan Hu Tang) is a combination of the classical Peony and Licorice Formula (Shao Yao Gan Cao Tang) with corydalis (yan hu suo). Peony and Licorice Formula is traditionally used for pain, cramping, or muscle spasms caused by injury to the liver blood or yin. Corydalis (yan hu suo) is used for pain from stagnation of qi or blood. These herbs together make this a suitable formula for many types of pain, muscle spasms, and cramps.
 
Chinese Medical Actions 
Moves blood and qi, soothes the liver, relieves pain, relaxes muscles, relieves spasms.
 
Indications
Abdominal pain
Back pain
Bronchial pain
Gallbladder spasms
Headache
Herpes zoster (shingles) pain
Insomnia from pain
Intestinal cramping
Menstrual pain
Muscular aches and spasms
Pancreatitis, pain from
Sciatica
Stomach pain
Toothache
Urinary bladder pain
Urination, painful