AVM-GSL Over the Counter

Blockade 2.56 mg/mL Teat Dip Solution

Active ingredient: Iodine

Form

Solution

Species

Cattle

Manufacturer

DeLaval NV

VMD MA No.

17140/3000

What it's used for

When used as a teat dip / teat spray is an aid in the prevention of the spread of mastitis in lactating dairy cattle, sheep and goats.

Full indications, dosage and side effects ↓

View official SPC (PDF)

The prescription itself has a price. See what practices near you charge for a consultation and the written prescription fee.

Paying less for Iodine

1

Ask your vet for a written prescription

They must provide one on request. Under the CMA Order the fee is capped at £21 from 2027.
2

Fill it at a registered online retailer

The CMA found online pharmacies 50–60% cheaper than practice dispensing on common medicines — typically £200–£300 a year.

Your prescription rights → VMD register of retailers →

Clinical information

Blockade 2.56 mg/mL Teat Dip Solution — SPC Details

Source: VMD Summary of Product Characteristics (SPC). Last updated 27 Mar 2026.

When used as a teat dip / teat spray is an aid in the prevention of the spread of
mastitis in lactating dairy cattle, sheep and goats.

Dosage: 5 ml per cow per treatment.
Dip each teat of the cow immediately after each milking in a dip cup containing
undiluted veterinary medicinal product. Ensure that the teat is covered to three quarters
of length and replenish the dip cup as necessary.
This veterinary medicinal product is intended as a teat dip for use after milking and can
be used up to two times per day.
The duration of the application is unlimited.
The dip cup should be emptied after each milking and cleaned thoroughly before using
again.
The use of the veterinary medicinal product should be associated with an accurate
udder and teat cleaning with an appropriate, moist cloth and drying of the teats prior to
milking.
Do not wipe disinfectant. In very cold weather, remove the excess disinfectant at the
end of the teat to prevent cracking and freezing, since sores can harbour bacteria.
If the veterinary medicinal product has frozen, thaw in a warm room and shake well
before use.

Do not use in cases of hypersensitivity to the active substance or to any of the
excipients.

None known.
Reporting adverse events is important. It allows continuous safety monitoring of a
veterinary medicinal product. Reports should be sent, preferably via a veterinarian, to
either the marketing authorisation holder or the national competent authority via the
national reporting system.
See the label for respective contact details.

The presence of milk or dirt neutralizes iodine, reducing its activity and effectiveness.
Ensure that the udder and teats are clean and dry before the next milking.

Special precautions for safe use in the target species:
For external use only.
The use in injured teats may delay wound healing process. It is recommended to
discontinue the treatment until the teats are cured.
Allow the veterinary medicinal product to dry before the cows are exposed to wet
(rainy), cold or windy weather conditions.
Special precautions to be taken by the person administering the veterinary medicinal
product to animals:
People with known hypersensitivity to iodine or to any of the excipients should avoid
contact with this veterinary medicinal product. If you develop symptoms following
exposure, such as skin rash you should seek medical advice and show the combined
package leaflet and label to the physician.
Avoid ingesting the veterinary medicinal product. In case of accidental ingestion seek
medical advice immediately and show the combined package leaflet and label to the
physician.
Do not eat, drink or smoke while using the veterinary medicinal product. This veterinary
medicinal product might be mildly irritating to skin and eyes. Avoid contact with skin
and eyes when administering the veterinary medicinal product. During application avoid
contact with hands or wear protective gloves. If the veterinary medicinal product comes
into contact with the eyes, rinse immediately with plenty of water.
Wash hands after use.
Special precautions for the protection of the environment:
Not applicable.

The veterinary medicinal product must not be used concurrently with other teat
disinfectants or care products.

Store upright and tightly closed in the original container.
Protect from frost.
Protect from light.
Do not store above 30 C.

Meat and offal: Zero days.
Milk: Zero hours.
4.

This information is sourced from the official Summary of Product Characteristics (SPC) published by the Veterinary Medicines Directorate (VMD). It is provided for informational purposes only and does not replace professional veterinary advice. Always consult your vet before administering any medication.