Lower dosage strength pharmaceutical compositions forumlated with 3.75% imiquimod

Abstract

Pharmaceutical formulations and methods for the topical or transdermal delivery of 1-isobutyl-1H-imidazo[4,5-c]-quinolin-4-amine or 1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-4-amine, i.e., imiquimod, to treat actinic keratosis with short durations of therapy, than currently prescribed for the commercially available Aldara® 5% imiquimod cream, as now approved by the U.S. Food & Drug Administration (“FDA”), are disclosed and described. More specifically, lower dosage strength imiquimod formulations to deliver an efficacious dose of imiquimod for treating actinic keratosis with an acceptable safety profile and dosing regimens that are short and more convenient for patient use than the dosing regimen currently approved by the U.S. Food & Drug Administration (“FDA”) for Aldara® 5% imiquimod cream to treat actinic keratosis are also disclosed and described.

Description

[0001]This application is a continuation of copending U.S. application Ser. No. 12 / 636,613, filed Dec. 11, 2009, which application claims the benefit of U.S. Provisional Application Ser. No. 61 / 205,145 filed Jan. 15, 2009, U.S. Provisional Application Ser. No. 61 / 144,731 filed Jan. 14, 2009, U.S. Provisional Application Ser. No. 61 / 139, 536 filed Dec. 19, 2008, the teaching of all of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to pharmaceutical formulations and methods for the topical or transdermal delivery of 1-isobutyl-1H-imidazo[4,5-c]-quinolin-4-amine, also known as (aka) 1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-4-amine, aka imiquimod, to treat actinic keratosis with shorter durations of therapy, than currently prescribed for the commercially available Aldara® 5% imiquimod cream, as now approved by the U.S. Food & Drug Administration (“FDA”). More specifically, the present invention is directed to lower dosage strengt...

AI Technical Summary

Benefits of technology

[0027]The present invention overcomes the above-mentioned limitations associated with the treatment of actinic keratosis with FDA-approved Aldara® 5% imiquimod cream through the discovery of novel and improved imiquimod treatment regimens of short duration, lower dosage strength imiquimod pharmaceutical formulations, and simplified dosing regimens to treat actinic keratosis.

[0028]Generally speaking, the present invention provides for new and improved substantially less-irritating lower dosage strength imiquimod pharmaceutical formulations, which are suitable for daily application in connection with substantially condensed treatment regimens and substantially expanded treatment areas, for topical and / or transdermal administration of an effective amount of imiquimod to treat subjects who are diagnosed with clinically typical, nonhyperkeratotic actinic keratosis (AK), preferably on the face or balding scalp of immunocompetent patients. In addition, the present invention provides for new and improved actinic keratosis treatments, wherein: (1) treatment periods of the present invention are substantially shorter in duration, i.e., up to six weeks and preferably up to four weeks, than the current FDA-approved 16-week treatment regimen for actinic keratosis treatment; (2) dosing regimens of the present invention are substantially simpler, i.e., one application daily each day for up to six weeks and preferably up to four weeks, than the current dosing regimen, i.e., once-a-day but only twice per week for 16 weeks, for the current FDA-approved Aldara® 5% imiquimod cream for actinic keratosis treatment; (3) treatment areas of the present invention are substantially larger, i.e., up to about 250 cm2, than the current FDA-approved treatment area, i.e., up to about 25 cm2, for Aldara® 5% imiquimod cream for actinic keratosis treatment; (4) number of AK lesions being treated in accordance with the present invention are substantially greater in number, i.e., between about 5 and about 20 or more AK lesions per treatment area, than the number of AK lesions, i.e., between about 4 and about 8 AK lesions per treatment area, generally being treated with the current FDA-approved Aldara® 5% imiquimod cream for actinic keratosis treatment; (5) less-irritating imiquimod pharmaceutical formulations of the present invention are formulated with a lower dosage strength, i.e., between about 1% and about 4.25% imiquimod, than the current FDA-approved Aldara® 5% imiquimod cream for actinic keratosis treatment; and (6) lower subject incidence of application site reactions is experienced in accordance with the present invention, as compared with higher subject incidence of application site reactions experienced with the current FDA-approved Aldara® 5% imiquimod cream and treatment regimen for actinic keratosis treatment.

[0029]In other words, the present invention provides for new and improved actinic keratosis treatments that cover larger treatment areas, have short durations of therapies, use lower imiquimod dosage strengths, have simplified daily dosing regimens, and have a lower incidence of application site reactions, as compared to treatment of actinic keratosis with Aldara® 5% imiquimod cream, as currently approved by the FDA.

Problems solved by technology

In addition, the cellular damage can even extend to the dermis, the layer of skin beneath the epidermis.

Additionally, the skin often becomes wrinkled, mottled, and discolored from chronic sun exposure.

However, even younger adults may develop actinic keratosis when living in geographic areas that are exposed to high-intensity sunlight year round, such as Florida and Southern California.

Actinic keratosis has become a significant health care issue in the United States of America.

Notwithstanding FDA approval, Aldara® 5% imiquimod cream treatment is not without limitation, including an unsimplified and lengthy dosing regimen.

Inconsistencies in both compliance and therapeutic results frequently occur with the treatment of actinic keratosis with FDA-approved Aldara® 5% imiquimod cream due to the lengthy treatment period, i.e., 16 weeks, the complicated dosing regimen, i.e., twice weekly, and the high incidence of application site reactions.

Images