Clarifoam EF

Generic Name: sulfur,sulfacetamide sodium
Dosage Form: aerosol, foam

Disclaimer: This drug has not been found by FDA to be safe and effective, and this labeling has not been approved by FDA. For further information about unapproved drugs, click here.

Clarifoam EF

Rx Only

Clarifoam EF Description

Sodium sulfacetamide is a sulfonamide with antibacterial activity while sulfur acts as a keratolytic agent. Chemically, sodium sulfacetamide is N-[(4-aminophenyl) sulfonyl]- acetamide, monosodium salt, monohydrate.

The structural formula is:

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Each gram of CLARIFOAM® EF (sodium sulfacetamide 10% and sulfur 5%) Emollient Foam contains 100 mg of sodium sulfacetamide and 50 mg of sulfur in an aqueous based emollient foam vehicle containing cetyl alcohol NF, emulsifying wax NF, lactic acid USP, methylparaben NF, propylene glycol USP, propylparaben NF, steareth-10, water USP. Also contains: Propellant HFA-134A (1,1,1,2-tetrafluoroethane).

Clarifoam EF - Clinical Pharmacology

Sodium sulfacetamide exhibits antibacterial activity. The most widely accepted mechanism of action of sulfonamides is the Woods-Fildes theory which is based on the fact that sulfonamides act as competitive antagonists to para-aminobenzoic acid (PABA), an essential component for bacterial growth. While absorption through intact skin has not been determined, sodium sulfacetamide is readily absorbed from the gastrointestinal tract when taken orally and excreted in the urine, largely unchanged. The biological half-life has variously been reported as 7 to 12.8 hours.

It is estimated that 1% of topically applied sulfur is absorbed. Although the exact mode of keratolytic activity of sulfur is unknown, it is reported to result from the interaction of sulfur with the cysteine content of keratinocytes. In combination with sulfacetamide, sulfur has been reported to inhibit the growth of Propionibacterium acnes thereby reducing the associated inflammation.


Clarifoam EF Emollient Foam is indicated in the topical control of acne vulgaris,acne rosacea and seborrheic dermatitis.


Clarifoam EF Emollient Foam is contraindicated for use by patients having known hypersensitivity to sulfonamides, sulfur or any other component of this preparation. Clarifoam EF Emollient Foam is not to be used by patients with kidney disease.


Although rare, hypersensitivity reactions to products containing sodium sulfacetamide may occur, including Stevens-Johnson syndrome and exfoliative dermatitis. Systemic toxic reactions such as agranulocytosis, acute hemolytic anemia, purpura hemorrhagica, drug fever, jaundice, and contact dermatitis indicate hypersensitivity to sulfonamides. Particular caution should be employed if areas of denuded or abraded skin are involved. FOR EXTERNAL USE ONLY. Keep away from eyes. Keep out of the reach of children. Contents under pressure. Do not puncture or incinerate container. Do not expose to temperatures above 120ºF (49ºC).


The object of this therapy is to achieve desquamation without irritation, but sodium sulfacetamide and sulfur can cause reddening and scaling of epidermis. These side effects are not unusual in the treatment of acne vulgaris, but patients should be cautioned about the possibility. If irritation develops, use of the product should be discontinued and appropriate therapy instituted. Patients should be carefully observed for possible local irritation or sensitization during long-term therapy.

Information for Patients

Avoid contact with eyes, eyelids, lips, and mucous membranes. If accidental contact occurs, rinse with water. If excessive irritation develops discontinue use and consult your physician.

Carcinogenesis, Mutagenesis and Impairment of Fertility

Long-term studies in animals have not been performed to evaluate carcinogenic potential.


Category C. Animal reproduction studies have not been conducted with Clarifoam EF Emollient Foam. It is also not known whether Clarifoam EF Emollient Foam can cause fetal harm when administered to a pregnant woman or can affect reproduction capacity. Clarifoam EF Emollient Foam should be given to a pregnant woman only if clearly needed.

Nursing Mothers

It is not known whether sodium sulfacetamide is excreted in the human milk following topical use of Clarifoam EF Emollient Foam. However, small amounts of orally administered sulfonamides have been reported to be eliminated in human milk. In view of this and because many drugs are excreted in human milk, caution should be exercised when Clarifoam EF Emollient Foam is administered to a nursing woman.

Pediatric Use

Safety and effectiveness in children under the age of 12 have not been established.

Adverse Reactions

Although rare, sodium sulfacetamide may cause local irritation.

Clarifoam EF Dosage and Administration

Shake Vigorously, Tap Bottom of Can and Prime Before Initial Use. Shake Vigorously and Tap Before Each Use.
To Prime: After shaking, gently tap bottom of can onto palm of other hand or a solid surface at least 3 times. Hold the can upright, direct away from patient, and firmly depress the actuator for 1 to 3 seconds or until foam begins to dispense. (If foam does not dispense within 3 seconds: re-shake can, gently tap bottom of can onto a solid surface at least 3 times, and depress the actuator again until foam begins to dispense.)
Before Each Use: Cleanse affected skin thoroughly and pat dry before each application. Shake vigorously and gently tap bottom of can onto palm of other hand or a solid surface at least 3 times.
During Use: Holding can upright, dispense Clarifoam EF Emollient Foam onto the fingertips.
WASH-OFF APPLICATION: Massage the dispensed foam into the affected area and
wait 10 minutes. Rinse thoroughly with water and pat dry. Treat the affected area 1 to 3
times daily, or as directed by a physician.
LEAVE-ON APPLICATION: Massage the foam into the affected area 1 to 3 times
daily, or as directed by a physician.
Wipe off any excess foam from actuator after use.

How is Clarifoam EF Supplied

Clarifoam EF Emollient Foam is supplied in a 60g (NDC 16781-154-60) aluminum can.

Store between 59° and 86°F (15° and 30°C).
Protect from freezing.
Store upright.

Manufactured For:

Onset Therapeutics
Cumberland, RI 02864

P/N 2603-pf Rev. 4


NDC 16781-154-06
Rx Only

Clarifoam® EF Emollient Foam
Sodium Sulfactetamide (10%), Sulfur (5%)

For topical control of acne vulgaris, acne rosacea, and senhorrheic dermatitis
See prescribing information enclosed


Clarifoam EF 
sulfur,sulfacetamide sodium aerosol, foam
Product Information
Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC:16781-154
Route of Administration TOPICAL DEA Schedule     
Active Ingredient/Active Moiety
Ingredient Name Basis of Strength Strength
SULFUR (SULFUR) SULFUR 5 g  in 100 g
Inactive Ingredients
Ingredient Name Strength
# Item Code Package Description
1 NDC:16781-154-06 5 g in 1 CAN
2 NDC:16781-154-11 10 g in 1 CAN
3 NDC:16781-154-60 60 g in 1 CAN
4 NDC:16781-154-96 100 g in 1 CAN
Marketing Information
Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date
Unapproved drug other 06/01/2007 06/30/2015
Labeler - Onset Dermatologics LLC (793223707)
Registrant - Onset Dermatologics LLC (964275155)
Name Address ID/FEI Operations
Onset Dermatologics LLC 793223707 MANUFACTURE(16781-154)
Revised: 06/2011
Onset Dermatologics LLC