Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Having -c- – wherein x is chalcogen – bonded directly to...
Reexamination Certificate
2000-03-27
2001-07-10
Spivack, Phyllis G. (Department: 1614)
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Having -c-, wherein x is chalcogen, bonded directly to...
Reexamination Certificate
active
06258831
ABSTRACT:
TECHNICAL FIELD
This invention is a pharmaceutical composition that is effective against the treatment of viruses. The composition can be used to treat viral infections, notably hepatitis, including hepatitis C virus (HCV) hepatitis B virus (HBV), human immunodeficiency syndrome (HIV), and Kaposi sarcoma (HHV8). The composition comprises one or more (5-aryl-1,2,4-thiadiazol)-3-yl- urea or (5-aryl-1,2,4-thiadiazol)-3-yl thiourea derivatives. Method of treating viral infections are also disclosed.
BACKGROUND OF THE INVENTION
HIV and other viral infections such as hepatitis are a few of the leading causes of death. HIV is the virus known to cause acquired immunodeficiency syndrome (AIDS) in humans. HIV is a disease in which a virus is replicated in the body or in host cells. The virus attacks the body's immune system.
Several drugs have been approved for treatment of this devastating disease, including azidovudine (AZT), didanosine (dideoxyinosine, ddI), d4T, zalcitabine (dideoxycytosine, ddC), nevirapine, lamivudine (epivir, 3TC), saquinavir (Invirase), ritonavir (Norvir), indinavir (Crixivan), and delavirdine (Rescriptor). See M. I. Johnston & D. F. Hoth, Science, 260(5112), 1286-1293 (1993) and D. D. Richman, Science, 272(5270), 1886-1888 (1996). An AIDS vaccine (Salk's vaccine) has been tested and several proteins which are chemokines from CD8 have been discovered to act as HIV suppressors. In addition to the above synthetic nucleoside analogs, proteins, and antibodies, several plants and substances derived from plants have been found to have in vitro anti-HIV activity. However, HIV virus is not easily destroyed nor is there a good mechanism for keeping the host cells from replicating the virus.
Thus, medical professionals continue to search for drugs that can prevent HIV infections, treat HIV carriers to prevent their disease from progressing to full-blown deadly AIDS, and to treat the AIDS patient.
Herpes simplex virus (HSV) types 1 and 2 are persistent viruses that commonly infect humans; they cause a variety of troubling human diseases. HSV type 1 causes oral “fever blisters” (recurrent herpes labialis), and HSV type 2 causes genital herpes, which has become a major venereal disease in many parts of the world. No fully satisfactory treatment for genital herpes currently exists. In addition, although it is uncommon, HSV can also cause encephalitis, a life-threatening infection of the brain. (The Merck Manual, Holvey, Ed., 1972; Whitley, Herpes Simplex Viruses, In: Virology, 2nd Ed., Raven Press (1990)). A most serious HSV-caused disorder is dendritic keratitis, an eye infection that produces a branched lesion of the cornea, which can in turn lead to permanent scarring and loss of vision. Ocular infections with HSV are a major cause of blindness. HSV is also a virus which is difficult, if not impossible to cure.
Hepatitis is a disease of the human liver. It is manifested with inflammation of the liver and is usually caused by viral infections and sometimes from toxic agents. Hepatitis may progress to liver cirrhosis, liver cancer, and eventually death. Several viruses such as hepatitis A, B, C, D, E and G are known to cause various types of viral hepatitis. Among them, HBV and HCV are the most serious. HBV is a DNA virus with avirion size of 42 nm. HCV is a RNA virus with a virion size of 30-60 nm. See D. S. Chen, J. Formos. Med. Assoc., 95(1), 6-12 (1996).
Hepatitis C infects 4 to 5 times the number of people infected with HIV. Hepatitis C is difficult to treat and it is estimated that there are 500 million people infected with it worldwide (about 15 time those infected with HIV). No effective immunization is currently available, and hepatitis C can only be controlled by other preventive measures such as improvement in hygiene and sanitary conditions and interrupting the route of transmission. At present, the only acceptable treatment for chronic hepatitis C is interferon which requires at least six (6) months of treatment and or ribavarin which can inhibit viral replication in infected cells and also improve liver function in some people. Treatment with interferon however has limited long term efficacy with a response rate about 25%.
Hepatitis B virus infection can lead to a wide spectrum of liver injury. Moreover, chronic hepatitis B infection has been linked to the subsequent development of hepatocellular carcinoma, a major cause of death. Current prevention of HBV infection is a hepatitis B vaccination which is safe and effective. However, vaccination is not effective in treating those already infected (i.e., carriers and patients). Many drugs have been used in treating chronic hepatitis B and none have been proven to be effective, except interferon.
Treatment of HCV and HBV with interferon has limited success and has frequently been associated with adverse side effects such as fatigue, fever, chills, headache, myalgias, arthralgias, mild alopecia, psychiatric effects and associated disorders, autoimmune phenomena and associated disorders and thyroid dysfunction.
Because the interferon therapy has limited efficacy and frequent adverse effects, a more effective regimen is needed.
In the present invention it has been discovered that the compounds described above are useful for the treatment of hepatitis C virus, hepatitis B virus, herpes simplex and the treatment of HIV infection and other viral infections.
SUMMARY OF THE INVENTION
A pharmaceutical composition for administering to treating animals, and in particular, warm blooded animals and humans, infected with a virus. The composition comprises a therapeutically effective amount of an anti-viral compound and optionally a pharmaceutical carrier. The anti-viral compound is selected from the group consisting of (5-aryl-1,2,4-thiadiazol)-3-yl thiourea derivatives or (5-aryl-1,2,4-thiadiazol)-3-yl urea derivatives having the formula:
wherein X is oxygen or sulfur, R is hydrogen or alkyl having from 1-3 carbons, n is 0-4, R
1
is independently selected from the group consisting of hydrogen, alkyl having from 1 to 7 carbon atoms, chloro, bromo or fluoro, oxychloro, alkoxy having the formula —O(CH
2
)
y
CH
3
wherein y is from 1 to 6 or a pharmaceutical addition salt or prodrug thereof.
Preferred anti-viral compositions comprise a therapeutically effective amount of the anti-viral compound (5-phenyl-1,2,4-thiadiazol)-3-yl thiourea (5-phenyl-3-thioureido-1,2,4-thiadiazole), which has the formula:
The compositions can be used to treat hepatitis C, hepatitis B, herpes simplex and other viral infections.
More specifically, this invention provides an anti-viral composition comprising a pharmaceutical carrier and a (5-aryl-1,2,4-thiadiazol)-3-yl thiourea derivative or (5-aryl-1,2,4-thiadiazol)-3-yl urea derivative as defined herein along with a method for treating viral infections for example, hepatitis C, hepatitis B. other hepatitis infections, HIV, influenza, and rhinoviruses, Kaposi's sarcoma, virus herpes simplex, and the like. The (5-aryl-1,2,4-thiadiazol)-3-yl thiourea or corresponding urea derivatives are also fungicidal and can be used to treat certain fungal infections. This same composition has utility against some fungi, in particular those which are common in HIV patients. Moreover the compounds are effective in the treatment of Bovine Diarrhea Virus and can be used in veterinary treatment for such disease.
The present invention also provides methods for the treatment of HIV infection comprising administering to a host infected with HIV a pharmaceutically or therapeutically effective or acceptable amount of a compound as described above.
The present invention also comprises the use of a combination therapy in the treatment of viral infections.
The compositions can be used in conjunction with other treatments. The route of administration is the same as for other medical treatments. The drug can be given daily or from 1 to 4 times a week.
DETAILED DESCRIPTION OF THE INVENTION
A. Definitions
As used herein, a “pharmaceutically acceptable” component is one that is suitable for use with humans and/or anima
Dabek Rose Ann
Miller Steven W.
Spivack Phyllis G.
The Procter & Gamble & Company
LandOfFree
Viral treatment does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Viral treatment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Viral treatment will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2470391