DMSO may help relieve pain but more studies are needed to confirm its safety and efficacy. There is no evidence that DMSO can treat cancer in humans.
DMSO is a widely used chemical solvent. It is rapidly absorbed when applied to the skin and has been shown to reduce pain and inflammation. However, there are concerns of adverse effects including damage to the nerves. DMSO is used as a prescription drug to treat inflammation and pain of the bladder and as an antidote for chemotherapy drugs that leak and are trapped inside the body. DMSO has not been shown to be an effective treatment for cancer in humans.
To reduce pain
Applying DMSO to the skin appears to reduce pain in humans.
To treat arthritis and osteoarthritis
A few studies show that application of DMSO to the skin reduces pain and inflammation in humans; however, more studies are needed to determine the optimal dose.
As a cancer treatment
Some laboratory studies have shown that DMSO may slow down the progression of cancer; however, clinical studies have not been performed.
To treat chemotherapy extravasations (chemotherapy that has leaked and become trapped in surrounding tissue)
DMSO may be used to treat this condition in a hospital setting.
To treat interstitial cystitis (inflammation and pain of the bladder of unknown origin)
DMSO is an accepted treatment for interstitial cystitis; however, more studies are needed to establish this use.
Dimethylsulfoxide (DMSO) is a widely used chemical solvent because of its high polarity. It is also used in the laboratories as a cryopreservative. DMSO is readily absorbed by the skin and has been studied as a vehicle for topical drugs. It is thought to have analgesic and anti-inflammatory properties and has been used topically to relieve pain and to treat arthritis.
Small scale studies conducted in the early 1980s suggested that DMSO may help relieve peripheral neuropathy (1) and post-thoracotomy pain (2). But a systematic review of DMSO reported a lack of definitive evidence against osteoarthritis (3) and painful bladder syndrome/interstitial cystitis (4)(5)(14).
DMSO has been used to prevent or treat extravasations of chemotherapeutic agents (6)(7). It may also slow down the progression of cancer cells; however, data are inconsistent (2)(8).
DMSO has been shown to cause neural damage in animals (9). Topical application results in a strong garlic taste in the mouth (10). Intravesical DMSO is an approved prescription drug for the treatment of interstitial cystitis. DMSO is not approved for use in other forms due to lack of efficacy and safety data.
Chemotherapy side effects
DMSO is diluted on exposure to air. Upon topical application, it rapidly penetrates the skin; however, unlike most penetrating solvents, it is not associated with irreversible membrane damage. DMSO can enhance the skin penetration of other drugs. Analgesic and anti-inflammatory effects may benefit patients with rheumatoid arthritis (2). In addition, DMSO traps free radical hydroxide; its antioxidant properties are thought to be responsible for the prevention of chemotherapy extravasations (7). A strong garlic taste in the mouth following DMSO administration is due to the exhaled dimethylsulfide (DMS) metabolite (11).
DMSO is an approved prescription drug for the treatment of interstitial cystitis intravesically only. It is not approved for over-the-counter use in any form due to inadequate evidence of efficacy and potential toxicities. The industrial form of DMSO may be contaminated with other chemicals.
Reported: Garlic taste in mouth, dry skin, erythema and pruritis (2), urine discoloration, halitosis, agitation, hypotension, sedation dizziness (13). Changes in eye lens have been reported in animals following administration of DMSO (12).