Dimethyl Sulfoxide (DMSO): Uses, Benefits, and Safety

What Is Dimethyl Sulfoxide?

Dimethyl sulfoxide (DMSO) is a colorless liquid chemical compound with the molecular formula (CH₃)₂S=O. Originally derived as a by-product from wood pulp during paper production, DMSO has become one of the most widely used organosulfur compounds in commercial and medical applications. The substance is a polar, aprotic solvent that is miscible with water and capable of dissolving both polar and nonpolar molecules, making it exceptionally versatile in pharmaceutical and industrial contexts.

From a chemical perspective, DMSO is notable for its remarkable stability and hygroscopic properties—meaning it readily absorbs moisture from the environment. These characteristics, combined with its ability to penetrate biological membranes, have made it a subject of intensive scientific research for over five decades.

History and Development of DMSO

The medical exploration of DMSO began in earnest during the early 1960s, when Dr. Stanley Jacob initiated groundbreaking organ preservation studies. These early investigations opened the door to subsequent pharmacotherapeutic research by Jacob’s laboratory and numerous other research groups worldwide. However, the therapeutic history of DMSO has been controversial, extensively debated in both scientific literature and popular media.

The compound’s journey through the regulatory landscape reflects this complexity. In 1978, the U.S. FDA approved DMSO specifically for treating interstitial cystitis, a chronic bladder condition. This approval came after a 1978 study demonstrated that DMSO brought significant relief to the majority of 213 patients studied with inflammatory genitourinary disorders. More recently, in 2009, PENNSAID—a topical formulation containing diclofenac in a 45.5% DMSO carrier—became the first topical DMSO product to receive FDA approval.

FDA-Approved Medical Uses

Currently, the FDA has officially approved DMSO for only one primary medical indication:

• Interstitial Cystitis (Painful Bladder Syndrome): DMSO is approved under the brand name RIMSO-50 for symptomatic relief of patients with this chronic bladder condition. This remains the only officially sanctioned use despite decades of research into other potential applications.

Additionally, PENNSAID (containing 45.5% DMSO) is FDA-approved as a topical medication for enhanced drug penetration through the skin. The FDA also granted “fast track” designation in 2007 for clinical studies examining DMSO’s potential in reducing brain tissue swelling following traumatic brain injury.

Purported Non-FDA Approved Uses

Although DMSO has not received FDA approval for these conditions, it has been extensively studied and promoted for various applications:

• Osteoarthritis and general joint pain relief
• Cancer treatment and chemotherapy side effect management
• Shingles (herpes zoster) under medical supervision
• Soft tissue injuries and musculoskeletal trauma
• Rheumatologic diseases
• Dermatological disorders
• Gastrointestinal diseases
• Amyloidosis
• Brain edema

However, it is crucial to note that anecdotal evidence suggests DMSO may help with arthritic pain, but there is currently no definitive scientific evidence proving its efficacy for arthritis or many other off-label uses.

How DMSO Works as a Penetration Enhancer

One of DMSO’s most distinctive pharmacological properties is its ability to enhance the penetration of other substances through biological membranes, particularly the skin. This characteristic has led to its investigation as a vehicle for administering topical medications. The mechanism involves DMSO’s unique chemical structure, which allows it to interact with skin lipids and proteins in ways that temporarily increase membrane permeability.

This penetration-enhancing property has practical applications in dermatology. Currently, DMSO is most commonly used as a keratolytic agent in conjunction with potassium hydroxide (KOH) to enhance visualization of fungal hyphae when diagnosing dermatophyte infections. Beyond this application, researchers continue exploring DMSO’s potential as an excipient—an inert substance used as a carrier for active pharmaceutical ingredients.

Anti-Inflammatory and Other Therapeutic Properties

Beyond its role as a penetration enhancer, DMSO exhibits several active pharmaceutical properties that contribute to its therapeutic potential:

• Anti-inflammatory effects: DMSO has demonstrated robust anti-inflammatory activity, making it valuable in treating inflammatory conditions
• Analgesic properties: The compound provides both local and systemic pain relief, contributing to its use in palliative care for advanced cancer patients
• Antiviral activity: Research suggests DMSO may have antiherpetic effects by reducing viral infectivity, inhibiting viral DNA replication, and reducing transcription of herpes simplex virus (HSV) genes
• Antifungal and antibacterial properties: DMSO demonstrates antimicrobial activity in preclinical applications
• Cancer therapy applications: Studies indicate DMSO may act as a differentiation-inducing agent, suppressing proliferation and inducing apoptosis in certain cancer cells

DMSO in Cancer Research

One particularly promising area of DMSO research involves its potential role in cancer therapy. Scientific evidence suggests that DMSO can contribute positively to the overall efficacy of cancer treatment through multiple mechanisms.

In laboratory studies, DMSO has demonstrated the ability to induce differentiation in leukemic cells. When added to culture medium containing cells from acute promyelocytic leukemia (APML) patients, DMSO induced cells to differentiate into mature granulocytes, including myelocytes, metamyelocytes, and segmented neutrophils. Critically, low-dose DMSO (0.1-1%) did not exhibit cytotoxicity or changes in cell viability, and only minimal cytotoxicity was observed at higher concentrations.

Additionally, low-dose DMSO has been shown to significantly enhance the antiproliferative effects of interferon-alpha (IFN-α) in human lung adenocarcinoma cells. Research also indicates that DMSO exposure inhibits cell division and arrests the cell cycle in G0/G1 state, potentially preventing cancer cell proliferation. Based on available research data, DMSO might function as an effective, safe, and inexpensive differentiation-inducing therapeutic agent to enhance the efficacy of established cancer treatments.

Safety Profile and Adverse Effects

General Safety and Toxicity

DMSO is generally considered a non-toxic solvent with a median lethal dose (LD₅₀) higher than ethanol when administered orally to rats—14,500 mg/kg for DMSO compared to 7,060 mg/kg for ethanol. This comparison suggests that DMSO has a relatively favorable toxicity profile compared to commonly accepted substances.

Common Adverse Effects

When DMSO is used topically, the most frequently reported adverse effects are generally mild:

• Dry skin at application site: Reported in 25.3% of patients in clinical studies
• Contact dermatitis: Observed in 13.0% of patients
• Flushing and allergic reactions: DMSO releases histamine, which can cause flushing and allergic responses, particularly at higher concentrations

Systemic Side Effects

When DMSO is administered intravenously, certain systemic effects have been documented:

• Nausea and vomiting: Sometimes observed during or after intravenous administration, though these symptoms typically resolve shortly after infusion and are less frequent at lower dosages
• Intravascular hemolysis: The most serious reported adverse effect occurs when DMSO is administered at concentrations of 40% or higher. This condition results from increased osmotic pressure on erythrocytes and can be avoided by limiting DMSO concentration to 30% or less

Drug Interactions and Contraindications

DMSO can enhance the absorption and effects of other substances through the skin, which creates potential for significant drug interactions. The compound is thought to increase the effects of:

• Blood thinners
• Steroids
• Heart medications
• Sedatives
• Other drugs

In some cases, these enhanced effects could be harmful or dangerous. Therefore, DMSO should not be used without medical supervision due to possible interactions with common medications and the lack of definitive research into its benefits.

Neurotoxicity Concerns

One particularly concerning finding involves potential neurotoxicity. DMSO exposure to developing mouse brains can produce brain degeneration, with this neurotoxicity detectable at doses as low as 0.3 mL/kg—a level that may be exceeded in children exposed to DMSO during bone marrow transplant procedures. This finding raises important questions about DMSO use in pediatric populations and warrants careful consideration in clinical applications.

Current Availability and Over-the-Counter Status

DMSO is available in multiple formulations, though availability varies by region:

• Prescription medication: RIMSO-50 (for interstitial cystitis) and PENNSAID (topical diclofenac carrier) require prescriptions
• Over-the-counter products: DMSO is available without a prescription most often in gel or cream form
• Retail availability: Can be purchased at health food stores, through mail order, and on the Internet
• Oral supplements: While sometimes found as an oral supplement, the safety profile of oral DMSO remains unclear

The widespread availability of DMSO without prescription has raised regulatory concerns and underscores the importance of medical supervision when using this substance.

Comparison of DMSO Applications

Frequently Asked Questions (FAQs)

Q: Is DMSO approved by the FDA?

A: DMSO is FDA-approved for treating interstitial cystitis (painful bladder syndrome) under the brand name RIMSO-50, and as a carrier in PENNSAID topical medication. However, it has no other official FDA approvals for conditions like arthritis or cancer, despite being studied for these uses.

Q: Can DMSO be used to treat arthritis?

A: While DMSO has been promoted for arthritis pain relief and some anecdotal evidence suggests potential benefits, there is no definitive scientific evidence proving its efficacy for this condition. Anyone considering DMSO for arthritis should consult with a healthcare provider.

Q: What are the most common side effects of DMSO?

A: The most common side effects of topical DMSO include dry skin at the application site (25.3% of users) and contact dermatitis (13.0%). When administered intravenously, nausea and vomiting may occur but typically resolve quickly. More serious effects are rare when used at appropriate concentrations.

Q: Is DMSO safe for children?

A: DMSO use in children raises concerns due to documented neurotoxicity in developing brains at relatively low doses. Children exposed to DMSO during bone marrow transplant procedures may exceed safe exposure levels. Pediatric use should only occur under close medical supervision.

Q: Can DMSO interact with other medications?

A: Yes, DMSO can increase the absorption and effects of other substances through the skin, potentially enhancing the effects of blood thinners, steroids, heart medications, and sedatives. This can create harmful drug interactions, so DMSO should not be used without medical supervision.

Q: Where can I purchase DMSO?

A: Prescription DMSO products (RIMSO-50 for interstitial cystitis) require a doctor’s prescription. Over-the-counter DMSO gels and creams are available at health food stores, through mail order, and online retailers without a prescription.

Q: What is DMSO’s mechanism of action as a drug carrier?

A: DMSO’s unique chemical structure allows it to penetrate biological membranes, particularly skin, by interacting with membrane lipids and proteins. This increases membrane permeability temporarily, allowing other substances to penetrate more effectively—which is why it’s used as a carrier in medications like PENNSAID.

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Author

Sneha TeteBeauty & Lifestyle Writer

 

Sneha is a relationships and lifestyle writer with a strong foundation in applied linguistics and certified training in relationship coaching. She brings over five years of writing experience to renewcure,  crafting thoughtful, research-driven content that empowers readers to build healthier relationships, boost emotional well-being, and embrace holistic living.

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