Methyl Salicylate Ointment (Ung Meth Sal) is a rub applied to the skin for muscular aches, joint pain, backache and sprains. “Ung” is the abbreviation for unguentum — Latin for ointment — used on pharmacy labels, and methyl salicylate is the active ingredient, chemically related to aspirin.
What is Methyl Salicylate Ointment (Ung Meth Sal)?
Ung Meth Sal is a dispensing abbreviation rather than a brand name. Pharmacists have long used Latin shorthand on labels, and Ung is the standard abbreviation for unguentum, ointment. So the label simply reads “methyl salicylate ointment”.
It is a pharmacopoeial preparation — a standard formula rather than a proprietary product — which is why it is generally dispensed as a plain-labelled tub rather than a branded pack, and why it does not appear in the medicine price register alongside branded products. That absence is unremarkable.
Methyl salicylate is the compound responsible for the smell of wintergreen. It belongs to the salicylate family, which includes aspirin, and it works in two ways when rubbed into skin:
As a counter-irritant. It produces a warming sensation that stimulates nerve endings in the skin. Those signals compete with, and partly mask, the deeper pain signals from muscle and joint — the same principle as rubbing a knock.
As a topical salicylate. A small amount is absorbed locally and has a mild anti-inflammatory effect at the site.
Most of the effect is the first of these. The warmth and the massage do a considerable part of the work — which is not a criticism, since for muscular aches that is often enough.
Methyl salicylate is frequently combined with menthol, camphor or eucalyptus oil in commercial rubs such as Deep Heat and Zam-Buk-type products. Read your own tub to see what is in it.
What is Methyl Salicylate Ointment (Ung Meth Sal) commonly used for?
- Muscular aches and stiffness, including after exercise or unaccustomed work.
- Backache and neck stiffness.
- Sprains and strains, once past the acute swelling stage.
- Joint pain, including mild arthritic pain in accessible joints.
- Fibrositis and rheumatic aches, in traditional use.
- Cramps and general muscular discomfort.
- Chest rubs, in some combination products — though those rely on menthol and camphor vapour rather than the salicylate.
It is symptomatic relief. It eases discomfort; it does not repair a strained muscle or treat arthritis.
What it should not be used for: an acute injury in the first 48 hours, where cold rather than heat is appropriate; open wounds or broken skin; a swollen, hot, red joint with fever, which needs medical assessment rather than a rub.
There is a better-evidenced alternative for joint pain. A topical NSAID gel — diclofenac or piroxicam — has considerably stronger evidence than counter-irritant rubs for osteoarthritis of the knee or hand. If that is what you are treating, ask a pharmacist about a gel.
How Methyl Salicylate Ointment (Ung Meth Sal) fits into this medicine category
| Group | Examples | How it works |
|---|---|---|
| Counter-irritant rubs | Methyl salicylate ointment, menthol and camphor rubs | Warming sensation masks deeper pain |
| Topical NSAIDs | Diclofenac gel, piroxicam gel | Genuine local anti-inflammatory effect; better evidence |
| Capsaicin creams | Capsaicin | Depletes pain signalling chemicals; used for nerve pain |
| Oral analgesics | Paracetamol | Pain and fever, taken by mouth |
| Oral anti-inflammatories | Diclofenac (K-Fenak OTC), ibuprofen | Stronger; stomach, kidney and heart cautions |
| Compound remedies | HP553 and similar | Several actions in one product |
Rubs are low-risk and can be used alongside oral treatment. See the general medicines hub.
What to check before using Methyl Salicylate Ointment (Ung Meth Sal)
The most important precaution concerns children. Methyl salicylate is highly toxic if swallowed, and it is concentrated — a small quantity of a strong preparation can be fatal to a young child. It also smells sweet and pleasant, which makes it appealing.
- Keep it well out of reach, and get emergency help immediately if a child swallows any, taking the container with you.
- Do not apply it to children without medical advice, and do not use it on anyone under 12 without asking a pharmacist. Salicylates in children are also associated with Reye’s syndrome.
Also check before using it if you:
- Are allergic to aspirin or other salicylates, or have aspirin-sensitive asthma.
- Take warfarin. Enough methyl salicylate can be absorbed through skin — particularly over large areas or with heat — to increase warfarin’s effect and bleeding risk. This is a documented interaction and is easy to overlook because it is “just a rub”.
- Are pregnant or breastfeeding. Avoid it near the breast if breastfeeding.
- Have broken, irritated or infected skin, eczema, or a rash at the site.
- Have kidney disease.
Using it:
- Apply a thin layer to the affected area and massage in gently.
- Wash your hands thoroughly afterwards — and keep it away from eyes, mouth and genitals, where it burns badly.
- Do not apply heat over it. No hot water bottles, heat pads, electric blankets or hot baths on treated skin. Heat greatly increases absorption, and serious burns have been reported.
- Do not bandage tightly or cover with an airtight dressing for the same reason.
- Do not use it on large areas, or repeatedly over many hours.
- Do not apply before intense exercise in hot conditions.
- Patch test on a small area if your skin is sensitive.
Possible cautions and when to ask a pharmacist or doctor
Common effects are local warmth, redness, stinging and mild irritation — expected, and the mechanism working.
Stop using it if the skin becomes markedly red, blistered, painful or itchy, or if a rash develops.
Get emergency help for:
- A child swallowing any amount — take the container with you, and do not wait for symptoms.
- Skin burns or blistering, particularly if heat has been applied.
- Swelling of the face, lips or tongue, difficulty breathing, or wheezing — especially in aspirin-sensitive asthma.
- Ringing in the ears, nausea, rapid breathing, confusion or dizziness — signs of salicylate absorption, which can occur with heavy or prolonged use over large areas.
Contact a doctor if:
- Pain persists beyond a week, or is worsening.
- A joint is hot, red, swollen, or you have a fever — that needs assessment, not a rub.
- Pain follows a significant injury, or you cannot bear weight.
- There is numbness, tingling or weakness, or back pain with bladder or bowel changes — those need urgent assessment.
- You take warfarin and have started using it regularly.
- You are treating arthritis — a topical NSAID gel has better evidence and is worth asking about.
Related medicine guides
Frequently asked questions
What is Ung Meth Sal used for? Rubbing into the skin for muscular aches, backache, joint pain, sprains and stiffness. “Ung” is the pharmacy abbreviation for ointment, and the active ingredient is methyl salicylate.
What does “Ung” mean? It is short for unguentum, Latin for ointment — traditional pharmacy shorthand used on dispensing labels.
Is it related to aspirin? Yes. Methyl salicylate is in the salicylate family, like aspirin, which is why aspirin allergy and warfarin both matter here.
Can I put a hot water bottle on it? No. Heat greatly increases absorption and serious burns have been reported. Avoid heat pads, hot baths and tight bandaging over treated skin.
Can I use it on my child? Not without medical advice, and not under 12 without asking a pharmacist. It is highly toxic if swallowed and smells appealing — keep it well out of reach.
Can I use it with warfarin? Ask your doctor. Enough can be absorbed through skin to increase warfarin’s effect and bleeding risk.
Does it actually work? It provides real symptomatic relief for muscular aches, mostly through the warming sensation and the massage. For joint arthritis, a topical NSAID gel has better evidence.
Can I use it on an open wound? No. Apply it only to intact, unbroken skin.