A200 Time-Tested Formula (Topical)

Generic name: pyrethrum extract and piperonyl butoxide (topical route) [ pye-REE-thrum-EX-trackt, PIP-er-oh-nil-byoo-TOX-ide ]
Drug class:Topical anti-infectives

Medically reviewed by Drugs.com. Last updated on Feb 2, 2022.

Commonly used brand name(s)

In the U.S.

• A200 Maximum Strength
• A200 Time-Tested Formula
• Lice-X
• Licide
• Medi-Lice Maximum Strength
• Pronto Maximum Strength
• Pyrinex
• Pyrinyl
• Rid
• Tisit

Available Dosage Forms:

• Foam
• Gel/Jelly
• Liquid
• Shampoo

Therapeutic Class: Pediculicide

Chemical Class: Pyrethrums

Uses for A200 Time-Tested Formula

Medicine containing pyrethrins is used to treat head, body, and pubic lice infections. This medicine is absorbed by the lice and destroys them by acting on their nervous systems. It does not affect humans in this way. The piperonyl butoxide is included to make the pyrethrins more effective in killing the lice. This combination medicine is known as a pediculicide.

This medicine is available without a prescription.

Before using A200 Time-Tested Formula

In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For this medicine, the following should be considered:

Allergies

Tell your doctor if you have ever had any unusual or allergic reaction to this medicine or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.

Pediatric

Although there is no specific information comparing use of pyrethrins and piperonyl butoxide combination in children with use in other age groups, this medicine is not expected to cause different side effects or problems in children than it does in adults.

Geriatric

Many medicines have not been studied specifically in older people. Therefore, it may not be known whether they work exactly the same way they do in younger adults. Although there is no specific information comparing use of pyrethrins and piperonyl butoxide combination medicine in the elderly with use in other age groups, this medicine is not expected to cause different side effects or problems in older people than it does in younger adults.

Breastfeeding

There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.

Interactions with medicines

Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. Tell your healthcare professional if you are taking any other prescription or nonprescription (over-the-counter [OTC]) medicine.

Interactions with food/tobacco/alcohol

Certain medicines should not be used at or around the time of eating food or eatin...