CHAPTER 1: DRUG DEVELOPMENT AND
REGULATION
INTRODUCTION TO PHARMACOLOGY
Pharmacology is the science that studies drugs and their interactions with living
organisms. It includes the study of drug sources, chemical properties, mechanisms of
action, therapeutic uses, adverse effects, and drug interactions.
A drug is a chemical substance that changes the function of the body and is used for
diagnosis, prevention, or treatment of diseases.
Pharmacology is divided into two major areas:
Pharmacodynamics (PD)
Pharmacodynamics describes what the drug does to the body. It explains the
relationship between the drug and its target, including receptor binding, mechanism of
action, and the effects produced by different drug doses.
Pharmacokinetics (PK)
Pharmacokinetics describes what the body does to the drug. It explains the movement
of drugs through the body by four processes called ADME:
Absorption: Movement of the drug from the administration site into the
bloodstream.
Distribution: Movement of the drug from blood to tissues.
Metabolism: Chemical transformation of the drug, mainly in the liver.
Excretion: Removal of the drug and its metabolites, mainly through the
kidneys.
SOURCES OF DRUGS
Drugs come from different sources, including natural, synthetic, and biotechnology
sources.
Natural Sources
Some drugs are obtained from plants, animals, and microorganisms. Natural products
have been important sources for developing many therapeutic agents.
Synthetic Drugs
, Many drugs are produced by chemical synthesis in laboratories. Synthetic production
allows better control over drug purity and quantity.
Biotechnology Products
Modern biotechnology uses genetic engineering to produce drugs. Examples include
recombinant proteins such as insulin and some biological therapies.
DRUG DISCOVERY AND DEVELOPMENT
Drug development begins with identifying a compound that may have therapeutic
benefits.
Scientists test many compounds to find drugs that are effective and safe.
The main steps include:
Drug Discovery
Researchers identify possible drug candidates and study their effects on biological
targets.
Preclinical Studies
Before testing in humans, drugs are studied in laboratory models and animals to
evaluate:
Safety.
Toxicity.
Pharmacological effects.
Appropriate dosage.
If the drug shows acceptable results, it can proceed to clinical trials.
CLINICAL TRIALS
Clinical trials are studies performed in humans to determine whether a drug is safe
and effective.
Phase I
Phase I trials involve a small number of healthy volunteers.
Goals:
Determine safety.
Identify safe dosage ranges.
REGULATION
INTRODUCTION TO PHARMACOLOGY
Pharmacology is the science that studies drugs and their interactions with living
organisms. It includes the study of drug sources, chemical properties, mechanisms of
action, therapeutic uses, adverse effects, and drug interactions.
A drug is a chemical substance that changes the function of the body and is used for
diagnosis, prevention, or treatment of diseases.
Pharmacology is divided into two major areas:
Pharmacodynamics (PD)
Pharmacodynamics describes what the drug does to the body. It explains the
relationship between the drug and its target, including receptor binding, mechanism of
action, and the effects produced by different drug doses.
Pharmacokinetics (PK)
Pharmacokinetics describes what the body does to the drug. It explains the movement
of drugs through the body by four processes called ADME:
Absorption: Movement of the drug from the administration site into the
bloodstream.
Distribution: Movement of the drug from blood to tissues.
Metabolism: Chemical transformation of the drug, mainly in the liver.
Excretion: Removal of the drug and its metabolites, mainly through the
kidneys.
SOURCES OF DRUGS
Drugs come from different sources, including natural, synthetic, and biotechnology
sources.
Natural Sources
Some drugs are obtained from plants, animals, and microorganisms. Natural products
have been important sources for developing many therapeutic agents.
Synthetic Drugs
, Many drugs are produced by chemical synthesis in laboratories. Synthetic production
allows better control over drug purity and quantity.
Biotechnology Products
Modern biotechnology uses genetic engineering to produce drugs. Examples include
recombinant proteins such as insulin and some biological therapies.
DRUG DISCOVERY AND DEVELOPMENT
Drug development begins with identifying a compound that may have therapeutic
benefits.
Scientists test many compounds to find drugs that are effective and safe.
The main steps include:
Drug Discovery
Researchers identify possible drug candidates and study their effects on biological
targets.
Preclinical Studies
Before testing in humans, drugs are studied in laboratory models and animals to
evaluate:
Safety.
Toxicity.
Pharmacological effects.
Appropriate dosage.
If the drug shows acceptable results, it can proceed to clinical trials.
CLINICAL TRIALS
Clinical trials are studies performed in humans to determine whether a drug is safe
and effective.
Phase I
Phase I trials involve a small number of healthy volunteers.
Goals:
Determine safety.
Identify safe dosage ranges.
