# US 5,346,692 A · Nail lacquer for the treatment of onychomycosis

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- Number: US 5,346,692 A
- Document ID: US5346692A
- Status: Granted
- Kind: A
- Application number: 08/043,927
- Filed: 1993-04-08
- Granted: 1994-09-13
- Earliest claimed: 1992-04-10
- Assignees: Roehm Pharma GmbH
- Inventors: Wolfgang Wohlrab; Katrin Wellner
- Web page: https://patentgrep.com/patent/US5346692A

## CPC

- A61K 8/4946: {Imidazoles or their condensed derivatives, e.g. benzimidazoles}
- A61K 8/731: {Cellulose; Quaternized cellulose derivatives}
- A61Q 3/00: Manicure or pedicure preparations
- A61Q 3/02: Nail coatings
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS

## Abstract

The invention relates to a nail lacquer for treating onychomycosis, comprised of a film-forming agent, an antimycotically active substance, and urea, wherewith the antimycotically active substance and the urea are liberated from the lacquer when the lacquer is applied. A preferred formulation comprises cellulose derivative(s) as film former(s), clotrimazole as the antimycotic (present in the amount of 5-30 wt. % based on the weight of the non-volatile components), urea (present in the amount of 15-60 wt. % based on the weight of the non-volatile components), and dibutyl phthalate as a plasticizer, in a solvent mixture comprised of acetone and ethanol.

## Claims

### Claim 1

A nail lacquer (nail polish) for treatment of onychomycosis, comprising:
a) a polymeric film forming agent,
b) at least one antimycotically active substance,
c) urea; and
d) a solvent which comprises
i) 50-70 wt. % of acetone; and
(ii) 30-50 wt. % of 90 volume % aqueous ethanol;
wherein in a first step, said polymeric film forming agent is dissolved in said acetone component of said solvent, and then in a second step, said antimycotically active substance and said urea are added to said polymeric film forming agent, in dissolved form in said aqueous ethanol; and
wherein following topical application and drying of said nail lacquer, the antimycotically active substance and said urea are liberated from the lacquer.

### Claim 2 (depends on 1)

The nail lacquer of claim 1, wherein said film forming agent is a cellulose derivative.

### Claim 3 (depends on 1, 2)

The nail lacquer of claims 2 or 1, further comprising 5-30 wt. %, based on the weight of the non-volatile components of a plasticizer, selected from the group consisting of phthalic acid ester, glycol, triacetin, camphor, castor oil and a mixture thereof.

### Claim 4 (depends on 1, 2)

The nail lacquer of claims 2 or 1, wherein said antimycotically active substance is clotrimazole.

### Claim 5 (depends on 1, 2)

The nail lacquer of claims 2 or 1, wherein said antimycotically active substance is present in the amount of 5-30 wt %, based on the weight of the non-volatile components.

### Claim 6 (depends on 1, 2)

The nail lacquer of claims 2 or 1, wherein said urea is present in the amount of 15-60 wt. %, based on the weight of the non-volatile components.

### Claim 7 (depends on 3)

The nail lacquer of claim 3, wherein said plasticizer is dibutyl phthalate.

### Claim 8 (depends on 3)

The nail lacquer of claim 3, further comprising 10-20 wt. %, based on the weight of the non-volatile components of a plasticizer, selected from the group consisting of phthalic acid ester, glycol, triacetin, camphor, castor oil and a mixture thereof.

### Claim 9 (depends on 5)

The nail lacquer of claim 5, wherein said antimycotically active substance is present in an amount of 10-20 wt. %, based on the weight of the non-volatile components.

### Claim 10 (depends on 6)

The nail lacquer of claim 6, wherein said urea is present in an amount of 20-50 wt. % based on the weight of the non-volatile components.

### Claim 11 (depends on 2)

The nail lacquer of claim 2, wherein said film forming agent is selective from the group consisting of cellulose acetate phthalate, cellulose acetate butyrate, cellulose acetate propionate, cellulose nitrate, cellulose sulfate, ethylcellulose, and cellulose acetate and a mixture thereof.

### Claim 12 (depends on 1)

The nail lacquer of claim 1, wherein said antimycotically active substance is selected from the group consisting of tioconazole, econazole, oxiconazole, miconazole, clotrimazole and a mixture thereof.

### Claim 13 (depends on 1)

A method of treating onychomycosis comprising applying the nail lacquer of claim 1 on the surface of a nail to be treated.