Mercurochrome is the bright red antiseptic that a generation of South Africans grew up having painted onto grazed knees. It was used to disinfect minor cuts and scrapes. It contains mercury, it has been withdrawn or deregistered in many countries including the United States, and it is no longer recommended — modern antiseptics do the same job better and without the mercury.
What is Mercurochrome?
Mercurochrome is a brand name for merbromin, an organomercury antiseptic dye. Its defining feature was the vivid red-orange stain it left on skin, which made treated wounds unmistakable.
On the South African Medicine Price Registry, mercurochrome does not appear as a standalone solution. It appears only as an ingredient in a handful of Schedule 4 compound ointments — products such as A.M.S. and Achromide, which combine mercurochrome with sulfanilamide, acriflavinium chloride and zinc oxide. These are old formulations and are not what most people mean when they ask about mercurochrome.
The red bottle of mercurochrome solution is largely history. It has been progressively withdrawn worldwide since the late 1990s.
The reason is mercury. Merbromin is roughly 26 per cent mercury by weight. In 1998 the United States Food and Drug Administration moved mercurochrome from “generally recognised as safe” to “unclassified”, which effectively ended its sale there. Many other countries followed. The concern was not that a single painted graze would poison anyone — it was that mercury is absorbed through broken skin, accumulates in the body, and has no safe biological role, and that repeated use on children, on larger wounds or on burns had no justification once safer antiseptics existed.
A second problem was the staining itself. The red dye masked the wound. Redness spreading from a cut is the main early sign of infection, and mercurochrome made it invisible — which is a meaningful drawback in an antiseptic.
If you have an old bottle in a cupboard, do not use it. Dispose of it at a pharmacy, which can handle mercury-containing waste, rather than pouring it down a drain or putting it in household rubbish.
What is Mercurochrome commonly used for?
Historically, it was applied to:
- Minor cuts, grazes and scrapes, particularly in children.
- Small wounds as a general antiseptic.
- Minor burns, in older practice.
- Umbilical cord care in newborns, in some countries — a use long since abandoned.
None of these are current recommendations. For each of them there is now a better option.
What to use instead, for a minor wound:
Clean water and mild soap are the most important step, and the one most often skipped. Rinsing dirt and debris out of a graze under running water does more to prevent infection than any antiseptic painted on afterwards.
Then, if you want an antiseptic:
- Povidone-iodine (Betadine) — broad-spectrum, well established. It also stains, though it washes off.
- Chlorhexidine — effective, non-staining, widely used. Keep it away from the eyes and ears.
- Cetrimide-based cleansers (Savlon and similar) — mild, suitable for routine graze cleaning.
- Hydrogen peroxide — still sold, but no longer favoured for routine wounds; it damages healing tissue as well as bacteria.
Then cover it. A clean dressing kept dry does more for healing than repeated antiseptic. Modern practice favours keeping a wound lightly moist and covered over letting it dry out and scab hard.
How Mercurochrome fits into this medicine category
| Group | Examples | Status |
|---|---|---|
| Mercurial antiseptics | Mercurochrome (merbromin), thiomersal | Obsolete; withdrawn in many countries |
| Iodine antiseptics | Povidone-iodine | Current, broad-spectrum |
| Chlorhexidine | Various skin preparations | Current, non-staining |
| Quaternary compounds | Cetrimide (Savlon) | Current, mild |
| Antibacterial creams | Mupirocin, fusidic acid | Prescription; for infected wounds |
| Topical steroids | Clomaderm | Inflammation, not wound cleaning |
| Antifungals | Canex V | Fungal skin infection |
Mercurochrome belongs to a generation of remedies — alongside gentian violet and various mercurial preparations — that were widely trusted, worked reasonably well, and have been superseded. Being familiar is not the same as being the best available option.
See the skin and wound care medicines hub.
What to check before using Mercurochrome
The honest answer is that you should not be using it.
If you are considering an old bottle, or a product sold informally or imported:
- Do not use it on children. Children absorb proportionally more through skin, and mercury accumulates.
- Do not use it on large wounds, deep wounds or burns. Absorption rises sharply with the area and depth of broken skin.
- Do not use it on the eyes, mouth or genitals.
- Do not use it in pregnancy or while breastfeeding.
- Do not use it repeatedly or over long periods.
- Do not use it on an umbilical stump. Clean, dry cord care is the current standard.
- Check for a SAHPRA registration number. A solution sold without one is not a registered South African medicine.
If you have a compound ointment containing mercurochrome — A.M.S., Achromide or similar — these are Schedule 4 and should be used only as directed by the prescriber who supplied them, not as a general-purpose antiseptic from the cupboard.
Dispose of old stock at a pharmacy. Mercury should not go into household waste or down a drain.
Possible cautions and when to ask a pharmacist or doctor
The main concerns with mercurochrome are mercury absorption, allergic sensitisation and masked infection.
Contact allergy to merbromin is well documented — a rash, itching or worsening redness at the application site. Confusingly, that reaction looks much like a wound infection, and the red stain makes distinguishing the two harder still.
Stop and seek advice for a rash, itching, swelling or blistering where it has been applied.
Get emergency help for swelling of the face, lips or tongue, difficulty breathing, or if a child has swallowed any.
See a doctor about the wound itself if:
- Redness is spreading from it, particularly as a streak up a limb.
- It is increasingly painful, swollen, warm, or discharging pus.
- You develop a fever.
- The wound is deep, gaping, or will not stop bleeding — it may need closing.
- It was caused by an animal or human bite, or by something dirty or rusty, or a puncture from a nail or thorn.
- There is something still in it — glass, grit, a splinter.
- It is not healing after a week or two.
- You have diabetes, poor circulation, or a weakened immune system. Foot wounds in diabetes in particular need professional assessment early, not home treatment.
- Your tetanus vaccination is out of date or you are unsure. Tetanus boosters are given at clinics, and a dirty or puncture wound is a clear reason to check.
A pharmacist can advise on all of this, including which antiseptic and dressing to use, and can tell you whether a wound needs a doctor. That conversation is free, immediate, and considerably more useful than anything in an old red bottle.
Related medicine guides
Frequently asked questions
What is mercurochrome solution used for? Historically, disinfecting minor cuts, grazes and scrapes. It is no longer recommended, and the standalone solution has been withdrawn in many countries.
Why was it banned? It contains mercury — about 26 per cent by weight — which is absorbed through broken skin and accumulates. The US FDA reclassified it in 1998, effectively ending its sale, and other countries followed.
Is mercurochrome still sold in South Africa? Not as a registered standalone solution. It appears only as an ingredient in a few old Schedule 4 compound ointments.
I have an old bottle. Can I still use it? No. Take it to a pharmacy for disposal — mercury should not go into household waste or down a drain.
What should I use instead? Rinse the wound with clean running water first, which matters most. Then, if you want an antiseptic, povidone-iodine, chlorhexidine or a cetrimide cleanser. Cover with a clean dressing.
Why is the red stain a problem? It hides the wound. Spreading redness is the main early sign of infection, and the dye makes it impossible to see.
Is it safe for children? No. Children absorb proportionally more through the skin, and this was one of the main reasons for withdrawing it.