Why is vigabatrin on the NIOSH hazardous drug list?

NIOSH lists vigabatrin in Table 2 of its 2024 list, flagged as a drug whose only hazard is possible harm to reproduction or development. It is not listed as a cancer-causing drug.

Do parents need to wear chemo gloves or an N95 to give vigabatrin?

The NIOSH and USP chapter 800 protective equipment rules are written for healthcare workers, not for families at home. Ask the pharmacist what precautions make sense for your home, such as washing hands and avoiding skin contact.

Should a pregnant caregiver give vigabatrin?

NIOSH lists vigabatrin because of possible harm to pregnancy and development. A caregiver who is pregnant, or trying to become pregnant, should ask the pharmacist or doctor how to handle doses and whether someone else should prepare them.

How do I dispose of leftover vigabatrin?

Follow the pharmacy's instructions or local guidance for medicine disposal. Ask the pharmacy whether they offer a take-back option. For powder, the label says to throw away any mixed solution left after each dose.

Vigabatrin Safe Handling: NIOSH Hazardous Drug Status

Short answer: vigabatrin is on the NIOSH list of hazardous drugs because it may harm pregnancy and development. It is not listed as a cancer-causing drug.¹ The NIOSH and USP chapter 800 handling rules, including gloves, gowns and masks, are written for healthcare workers, not for families at home.^2,3 At home, simple precautions agreed with your pharmacist are what matter.

NIOSH is the National Institute for Occupational Safety and Health, the US agency that studies workplace health risks. USP chapter 800 is a pharmacy standard for handling hazardous drugs in healthcare settings.

Why vigabatrin is on the NIOSH list

The 2024 NIOSH List of Hazardous Drugs in Healthcare Settings puts vigabatrin in Table 2, with the flag "Only Developmental and/or Reproductive Hazard" marked yes.¹ Table 2 holds drugs that meet the NIOSH definition of a hazardous drug, have no special handling information from the manufacturer, and are not classed as known or probable human carcinogens.¹

In the earlier 2016 list, vigabatrin sat in Table 3, which held non-cancer drugs with only reproductive or developmental hazards. The 2024 list merged that group into Table 2 with a flag. The move reflects that merger.¹

The listing is about people who handle the medicine, such as nurses and pharmacy staff. It is separate from the vision-loss warning that applies to the person taking it. See side effects and vision loss for those risks.

What NIOSH says for healthcare settings

NIOSH guidance for healthcare workers is direct about manipulating tablets: "Crushing tablets or opening capsules should be avoided, and liquid formulations should be used whenever possible."² It explains that "cutting, crushing, or otherwise manipulating tablets and capsules will increase the potential for exposure of workers."²

The guidance lists protective steps by task:²

Task in a healthcare setting	NIOSH control approach
Giving intact tablets	Single gloves
Crushing or otherwise manipulating tablets	Ventilated enclosure, double chemotherapy gloves and a gown; an N95 mask if done outside the enclosure; consider a pill pouch
Giving an oral liquid by mouth or feeding tube	Double gloves and a gown; eye protection if splashing is likely

Two points stand out. First, a liquid is not exempt: NIOSH still advises gloves and a gown for staff giving any oral liquid hazardous drug. Second, even drugs with only reproductive hazards call for risk management for all staff, not only staff who are pregnant.²

What USP chapter 800 adds

USP chapter 800 became official in December 2019 and applicable from November 2023.³ Vigabatrin is neither a raw drug ingredient nor one of the cancer drugs in NIOSH Table 1. For drugs like it, a facility may do an "assessment of risk" for each drug and dosage form instead of applying every containment rule. USP notes that "crushing HD tablets or opening capsules may have more risk of exposure than dispensing tablets without further manipulation." Examples of ways to lower risk include unit-dose packaging and reassigning pregnant staff.³

USP chapter 800 covers healthcare personnel and settings. It does not apply to parents and caregivers at home.³ A pharmacy or clinic that crushes vigabatrin tablets or prepares doses should follow its own vigabatrin assessment of risk.

How the forms compare for handling

Each form involves different steps. This table describes what each one asks of the person giving it. It is not a ranking of overall safety.

Form	What handling involves	What the guidance says
Ready-to-use liquid (Vigafyde)	Draw the dose from the bottle with an oral syringe. No pouring powder, mixing or crushing.⁴	NIOSH prefers liquids over crushing tablets or opening capsules, but still advises gloves and a gown for healthcare staff giving any oral liquid.²
Powder sachets	Open each packet, pour the powder into a cup, dissolve in water, draw up the dose and throw away the rest. This happens for every dose.⁵	The NIOSH lines quoted above name crushing tablets and opening capsules. They do not single out powder packets.
Tablets	Scored 500 mg tablets.⁶ Splitting or crushing them adds handling.	Intact tablets: single gloves for staff. Crushing: ventilated enclosure, double gloves, gown, N95 if outside the enclosure.²

There is no study measuring how much vigabatrin a caregiver is exposed to with any form at home. The ready-to-use liquid is labeled only for infantile spasms in babies 1 month to 2 years old, so it is not an option for older children or adults.⁴

Sensible precautions at home

These are general precautions, not rules from NIOSH or USP. Talk them through with your pharmacist, who knows your child's form and dose.

Wash your hands before and after preparing or giving each dose.
Avoid skin contact with powder or liquid. Wipe up spills with a damp paper towel and wash the surface.
Prepare doses in one place, away from food, using the cup and syringe from the pharmacy.
Do not crush or split tablets unless the prescriber or pharmacist has told you to, and ask them how.
If you are pregnant, or trying to become pregnant, ask the pharmacist or doctor how to handle doses, and whether someone else in the home should prepare them.
Store vigabatrin where children and pets cannot reach it.
Dispose of leftover medicine as the pharmacy or local guidance advises. With powder, the label says to throw away any mixed solution left after each dose.⁵

The N95 masks, gowns and chemotherapy gloves in the NIOSH table are set for healthcare workers who handle many doses for many patients. Ask your care team whether any protective equipment makes sense in your home. For questions about exposure, the pharmacist is a good first call.

For dosing questions, see dosage.

Handling vigabatrin safely