Drug Discovery New Drug Development Process

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  • 1.DRUG DISCOVERY NEW DRUG DEVELOPMENT PROCESS BY Dr. BASAVARAJ K. NANJWADE Department of Pharmaceutics K L E UNIVERSITY JN MEDICAL COLLEGE BELGAUM 590010 E-mail: bknanjwade@yahoo.co.in

2.

  • A substance used in the diagnosis, treatment, or prevention of a disease or as a component of a medication recognized or defined by the U.S. Food, Drug, and Cosmetic Act.
  • Adrugis any chemical or biological substance, synthetic or non-synthetic

DRUG 3.

  • A drug is anything that affects the way an organism works.
  • Drugs can be taken to enhance function, such as a student drinking caffeine to enhance alertness.
  • For now we only consider drugs which are used to cure a disease.

Continued 4.

  • A disease is often thought of as an infection, where a bacteria, virus, or other living thing invades the body.
  • However, a disease is anything which affects the proper functioning of the body.
  • It can be an infection, a genetic disorder, or the result of environmental conditions such as malnourishment, poisoning, or stress.

Continued 5.

  • Engineers often find it easy to see the body as a factory.
  • Individual organs can be seen as machinery. The actual nuts, bolts, screwdrivers, and wrenches that make up all the machinery are the equivalent of proteins, little chunks of organic material that move things around in the body and attach them together.
  • Most of the work in our body is done by proteins.

Continued 6.

  • The body contains thousands of different kinds of proteins.
  • The construction of each is determined by the DNA in the nucleus of each cell.
  • DNA may be thought of as long strings of instructions which code for how each protein is too be built.
  • The DNA is just a long string of acids that serves as a message about how to make proteins.

7. How Drugs are Developed

  • The processes of new drug discovery and development are long, complicated and dependent upon the expertise of a wide variety of scientific, technical and managerial groups.
  • If you are new to the industry, it can prove a significant challenge to understand the significance of your contribution, even if you belong to one of the teams directly involved; for those on the periphery, the problem is magnified to the point where team interactions and efficiency are adversely threatened.

8. Differences and Similarities of Drugs and Medicinal Plants

  • Today there are at least 120 distinct chemical substances derived from plants that are considered important drug and are currently in use in one or more countries in the world
  • Some of these drugs are simply a chemical or chemicals extracted from plant materials and put into a capsule, tablet or liquid.
  • Eg. In Germany aCynarindrug is manufacturedand sold to treat hypertension, liver disorders and highly cholesterol levels.

9. Differences and Similarities of Drugs and Medicinal Plants

  • The drug is simply this single chemical or an Artichoke liquid extract, that has been concentrated and chemically manipulated to contain a specific amount of this one chemical ; such a preparation is called a standardized extract.
  • However in the U.S artichoke extracts are available as natural products and sold in health food stores as dietary supplements
  • Some U.S artichoke products are even standardized to contain a specific amount of cynarin, yet they can still be purchased here as a natural product without a prescription.
  • There may be little to no difference between the Cynarin drug produce in Germany and the artichoke standardized herbal supplements made in the U.S considering that the same amount of Cynarin is being delivered, dose for dose

10. Need for consumer education about Herbal supplements & Drugs

  • Consumers find it very frustrating to sort through a lot of ambiguous information put out by natural product manufacturers who cannot legally label their goods with condition-specific.
  • Stop them in their tracks in the aisles at the health food store saying Hey, look at me, if you have high cholesterol.

11. More is Not Always Better

  • Be careful about dosage amounts
  • Philosophy of excess: if some is good, more is better

12. Problem of One Vs Several Chemicals

  • While many drugs have originated from biologically active plant chemicals, and many plants, medicine uses can be attributed to various active chemicals found in them, there is a distinct difference between using a medicinal plant and a chemical drug.
  • The difference is one that scares most conventionally trained doctors with no training in plants.
  • Drugs usually consist of a single chemical, whereas medicinal plants can contain 400 or more chemicals.
  • Its relatively easy to figure out the activity and side effects of a single chemical.

13. Plant Based Drugs and Medicines Anisodus tanguticus Anticholinergic Anisodamine Andrographis paniculata Baccillary dysentery Andrographolide Anabasis sphylla Skeletal muscle relaxant Anabesine Brassica nigra Rubefacient Allyl isothiocyanate Several plants Vulnerary Allantoin Rauvolfia sepentina Circulatory Disorders Ajmalicine Agrimonia supatoria Anthelmintic Agrimophol Frazinus rhychophylla Anti-dysentery Aesculetin Aesculus hippocastanum Anti-inflammatory Aescin Adonis vernalis Cardiotonic Adoniside Digitalis lanata Cardiotonic Acetyldigoxin Plant Source Action/Clinical Use Drug/Chemical 14. Plant Based Drugs and MedicinesCamellia sinensis CNS stimulant Caffeine Ananas comosus Anti-inflammatory, proteolytic Bromelain Several plants Antipyretic, analgesic, antiinflammatory Borneol Betula alba Anticancerous Betulinicacid Ardisia japonica Antitussive Bergenin Berberis vulgaris Bacillary dysentery Berberine Several plants Scabicide Benzyl benzoate Atropa belladonna Anticholinergic Atropine Centella asiatica Vulnerary Asiaticoside Areca catechu Anthelmintic Arecoline Anisodus tanguticus Anticholinergic Anisodine Plant Source Action/Clinical Use Drug/Chemical 15. Plant Based Drugs and Medicines Curcumalonga Choleretic Curcumin Convallaria majalis Cardiotonic Convallatoxin Colchicumautumnale Antitumor agent, anti-gout Colchicine Colchicumautumnale Antitumor agent Colchiceineamide Papaver somniferum Analgesic, antitussive Codeine Erythroxylum coca Local anaesthetic Cocaine Cissampelos pareira Skeletal muscle relaxant Cissampeline Caricapapaya Proteolytic, mucolytic Chymopapain Potentilla fragarioides Haemostatic (+)-Catechin Camptotheca acuminata Anticancerous Camptothecin Cinnamomum camphora Rubefacient Camphor Plant Source Action/Clinical Use Drug/Chemical 16. Plant Based Drugs and Medicines Ephedrine Cephaelis ipecacuanha Amoebicide, emetic Emetine Digitalis purpurea Cardiotonic Digoxin Digitalis purpurea Cardiotonic Digitoxin Digitalis purpurea Cardiotonic Digitalin Mucunasp Anti-parkinsonism L-Dopa Digitalis lanata Cardiotonic Deslanoside Rauvolfia canescens Antihypertensive, tranquillizer Deserpidine Colchicum autumnale Antitumor agent Demecolcine Cassia species Laxative Danthron Cynara scolymus Choleretic Cynarin Plant Source Action/Clinical Use Drug/Chemical 17. Plant Based Drugs and Medicines Citrus species Capillary fragility Hesperidin Hemsleya amabilis Bacillary dysentery Hemsleyadin Gossypium species Male contraceptive Gossypol Glycyrrhiza glabra Sweetener, Addison's disease Glycyrrhizin Octea glaziovii Antidepressant Glasiovine Glaucium flavum Antitussive Glaucine Simarouba glauca Amoebicide Glaucarubin Digitalis purpurea Cardiotonic Gitalin Lycoris squamigera Cholinesterase inhibitor Galanthamine Podophyllum peltatum Antitumor agent Etoposide Plant Source Action/Clinical Use Drug/Chemical 18. Plant Based Drugs and Medicines Gaultheria procumbens Rubefacient Methyl salicylate Menthaspecies Rubefacient Menthol Lobelia inflata Smoking deterrant, respiratory stimulant a-LobelineTabebuiasp. Anticancer, antitumor Lapachol Digitalis lanata Cardiotonic Lanatosides A, B, C Ammi visaga Bronchodilator Kheltin Piper methysticum Tranquillizer Kawain Digenea simplex Ascaricide Kaibic acud Camptotheca acuminata Anticancer, antitumor agent Irinotecan Hyoscyamus niger Anticholinergic Hyoscyamine Plant Source Action/Clinical Use Drug/Chemical 19. Plant Based Drugs and Medicines Caricapapaya Proteolytic, mucolytic Papain Coptis japonica Antipyretic, detoxicant Palmatine Sophora pschycarpa Oxytocic Pachycarpine Strophanthus gratus Cardiotonic Ouabain Papaver somniferum Antitussive Noscapine Larrea divaricata Antioxidant Nordihydroguaiaretic acid Nicotiana tabacum Insecticide Nicotine Andrographis paniculata Dysentery Neoandrographolide Papaver somniferum Analgesic Morphine Crotalaria sessiliflora Antitumor agent (topical) Monocrotaline Plant Source Action/Clinical Use Drug/Chemical 20. Plant Based Drugs and Medicines Cinchonaledgeriana Antiarrhythmic Quinidine Ephedra sinica Sympathomimetic Pseudoephedrine, nor-Ephedra sinica Sympathomimetic Pseudoephredrine* Veratrum album Antihypertensives Protoveratrines A, B Podophyllum peltatum Antitumor anticancer agent Podophyllotoxin Several plants Expectorant Pinitol Pilocarpusjaborandi Parasympathomimetic Pilocarpine Anamirta cocculus Analeptic Picrotoxin Physostigma venenosum Cholinesterase Inhibitor Physostigmine Hydrangea macrophylla Sweetner Phyllodulcin Plant Source Action/Clinical Use Drug/Chemical 21. Plant Based Drugs and Medicines Citrus species Capillary fragility Rutin Stephania sinica Analagesic, sedative, traquillizer Rotundine Lonchocarpus nicou Piscicide, Insecticide Rotenone Rorippa indica Antitussive Rorifone Rhododendron molle Antihypertensive, tranquillizer Rhomitoxin Rauvolfia serpentina Antihypertensive, tranquillizer Reserpine Rauvolfia serpentina Antihypertensive, tranquillizer Rescinnamine Quisqualis indica Anthelmintic Qulsqualic acid Plant Source Action/Clinical Use Drug/Chemical 22. Plant Based Drugs and Medicines Strychnos nux-vomica CNS stimulant Strychnine Stevia rebaudiana Sweetner Stevioside Cytisus scoparius Oxytocic Sparteine Silybum marianum Antihepatotoxic Silymarin Cassia species Laxative Sennosides A, B Datura species Sedative Scopolamine Urginea maritima Cardiotonic Scillarin A Artemisia maritma Ascaricide Santonin Sanguinaria canadensis Dental plaque inhibitor Sanguinarine Salix alba Analgesic Salicin Plant Source Action/Clinical Use Drug/Chemical 23. Plant Based Drugs and Medicines Thymus vulgaris Antifungal (topical) Thymol Theobromacacao and others Diuretic, brochodilator Theophylline Theobromacacao Diuretic, vasodilator Theobromine Stephania tetrandra Antihypertensive Tetrandrine Corydalis ambigua Analgesic, sedative, traquillizer Tetrahydropalmatine Cannabis sativa Antiemetic, decrease occular tension a- Tetrahydrocannabinol (THC) Podophyllum peltatum Antitumor agent Teniposide Taxus brevifolia Antitumor agent Taxol Plant Source Action/Clinical Use Drug/Chemical 24. Plant Based Drugs and Medicines Daphne genkwa Abortifacient Yuanhuadine Daphne genkwa Abortifacient Yuanhuacine Pausinystalia yohimbe Aphrodisiac Yohimbine Catharanthus roseus Antitumor, Antileukemic agent Vincristine Catharanthus roseus Antitumor, Antileukemic agent Vinblastine Vincaminor Cerebral stimulant Vasicine Valeriana officinalis Sedative Valapotriates Chondodendron tomentosum Skeletal muscle relaxant Tubocurarine Trichosanthes kirilowii Abortifacient Trichosanthin Camptotheca acuminata Antitumor, anticancer agent Topotecan Plant Source Action/Clinical Use Drug/Chemical 25. The New Drug Development Process (Steps from Test Tube to New Drug Application Review) 26.

  • Non-clinical drug development is a complex, regulatory-driven process designed primarily to assess the safety and viability of new molecular entities.
  • Non-clinical, or preclinical, services encompass toxicology, pharmacology, metabolism, bioanalysis, pharmaceutical analysis and biosafety testing in support of non-clinical drug development.

Non-clinical Drug Development 27.

  • A sponsor must first submit data showing thatthe drug is reasonably safe for use in initial, small-scale clinical studies.
  • Depending on whether the compound has been studied or marketed previously, the sponsor may have several options for fulfilling this requirement.
  • 1. Compiling existing non-clinical data from pastin vitro
  • laboratory or animal studies on the compound
  • 2. Compiling data from previous clinical testing or marketing of the
  • drug in the U.S or another country whose population is relevant to
  • the U.S population
  • 3. Undertaking new preclinical studies designed to provide the
  • evidence necessary to support the safety of administering the
  • compound to humans.

Non-clinical Drug Development 28.

  • During preclinical drug development, a sponsor evaluates the drugs toxic and pharmacologic effects throughin vitroandin vivolaboratory animal testing.
  • Genotoxicity screening is performed, as well as investigations on drug absorption and metabolism, the toxicity of the drugs metabolites and the speed with which the drug and its metabolites are excreted from the body.

Non-clinical Drug Development 29. FDA will generally ask

  • Develop a pharmacological profile of the drug
  • Determine the acute toxicity of the drug in at least two species of animals
  • Conduct short-term toxicity studies ranging from 2 weeks to 3 months, depending on the proposed duration of use of the substance in the proposed clinical studies.

30.

  • CFR (Code of Federal Regulations) establishes procedure to expedite the development, evaluation and marketing of new therapies intended to treat people with life-threatening and severely-debilitating illnesses, especially where no satisfactory alternatives exist.

Subpart E 31.

  • Prior to clinical studies, the sponsor needs evidence that the compound is biologically active, and both sponsor and the FDA need data showing that the drug is reasonably safe for initial administration to humans.
  • Meeting at such an early stage in the process are useful opportunities for open discussion about testing phases, data, requirements, and any scientific issues that may need to be resolved prior to IND submission
  • At these meeting, the sponsor and FDA discuss and agree upon the design of the animal studies needed to initiate human testing

Sponsor/FDA Meetings ( Pre-IND) 32.

  • The research process is complicated, time-consuming, and costly and the end result is never guaranteed.
  • Literally hundreds and sometimes thousands of chemical compounds must be made and tested in an effort to find one that can achieve a desirable result.
  • FDA estimates that it takes approximately eight and half years to study and test a new drug before it can be approved for the general public.
  • Computers can be used to simulate a chemical compound and design chemical structures that might work against it.
  • Enzymes attach to the correct site on a cells membrane, which causes the disease.
  • A computer can show scientists what the receptor site looks like and how one might tailor a compound to block an enzyme from attaching there.

Synthesis and Purification 33.

  • Drug companies make every effort to use as few animals as possible and to ensure their humane and proper ca...