Source: Health Products and Food Branch (CA) Revision Year: 2012
NYDA is a topical treatment of scalp hair in case of infestation with head lice (pediculosis capitis). If used as instructed, NYDA is also effective against nymphs and eggs (nits).
Appropriate dosage for adult and/or children (2 years or older).
NYDA is sprayed carefully over the whole hair. The solution should be massaged in well until the hair is completely wetted with the solution. Dosage varies dependent upon thickness and length of hair.
Before NYDA is used for the first time, the enclosed dispensing pump must be screwed onto the glass bottle. Always hold the spray bottle upright or the pump will not be able to work properly. Please note that the pump will need to be primed, by pumping, when used for the first time and when it has been unused for a long period.
Inspect all scalp hair of each family member or care giver with the NYDA lice comb. Treat everyone with lice on the same day to avoid re-infestation. A normal comb or brush can be used before treatment to remove any tangles. This comb should be cleaned thoroughly after use. Cover the shoulders with a towel to protect the clothing.
NYDA should be applied to dry hair.
1. The infested hair should be completely covered with NYDA and left for 30 minutes.
NYDA is sprayed carefully over the whole hair. The solution should be massaged in well until the hair is completely wetted with the solution. This can be done using the lice comb, for example. This ensures that all lice, nymphs and nits come into contact with this solution and that the product can work with optimum efficacy. The amount of NYDA needed depends on the thickness and length of the hair. The hair near the scalp and behind the ears should be well covered with NYDA, as this is where most lice and nits are found. NYDA should be left on for at least 30 minutes.
Usual dose:
Appropriate dosage for adult and/or children (2 years or older).
Hair Length | Average vol. per appl. (mL) |
---|---|
Short | 10 |
Shoulder length (medium) | 18 |
Long | 22 |
Very Long | 34 |
2. After 30 minutes, the hair may be carefully combed using a lice comb.
After NYDA has been left on for at least 30 minutes, the hair may be combed carefully with the lice comb to remove the suffocated lice and nymphs. NYDA makes combing easier because it contains special ingredients which make even long hair very easy to comb.
3. The hair should be left to dry for at least 8 hours (e.g. overnight).
4. The hair can then be washed with normal commercial shampoo.
5. After 8 to 10 days, the treatment must be repeated.
For complete control of head lice and nits, the treatment must be repeated as described above after 8 to 10 days.
For management of patients who ingest NYDA, contact your regional Poison Control Centre.
Store between 15-30°C.
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