In Chinese medicine, myrrh is classified as bitter, spicy, neutral in temperature and affecting the heart, liver, and spleen meridians. Its uses are similar to those of frankincense, with which it is often combined in decoctions, liniments and incense. When used in concert, myrrh is "blood-moving" while frankincense moves the Qi, making it more useful for arthritic conditions. Myrrh also has been used in the treatment of amenorrhea, dysmenorrhea, menopause and uterine tumors, as its "blood-moving" properties can purge stagnant blood out of the uterus. Myrrh has also been recommended to help toothache pain, and can be used in liniment for bruises, aches and sprains. Myrrh is most commonly used in Chinese medicine for rheumatic, arthritic and circulatory problems. It is combined with such herbs as notoginseng, safflower stamens, Angelica sinensis, cinnamon and Salvia miltiorrhiza, usually in alcohol, and used both internally and externally. Myrrh is used more frequently in Ayurveda, Unani medicine and Western herbalism, which ascribe to it tonic and rejuvenative properties. A related species, known as guggul in Ayurvedic medicine is considered one of the best substances for the treatment of circulatory problems, nervous system disorders and rheumatic complaints. Myrrh (Daindhava) is used in many rasayana formulas in Ayurveda. However rasayana herbs have special processing. Outside of this form myrrh is said to be contraindicated for pregnant women or women with excessive uterine bleeding, and not be used with evidence of kidney dysfunction or stomach pain. As of 2008, 35% of Saudi Arabians use myrrh as medicine.