Branches of Pharmacology with 15 Subdivisions

Pharmacology is a branch of medical science that deals with a drug’s action and its fate in the body.

It has two broad divisions like pharmacokinetics and pharmacodynamics but, it can be categorized into further sub-divisions.

Pharmacology describes the different classes of medicine available in the allopathic system (modern medicine), their mechanism, distribution, deterioration (metabolism), and excretion.

It is an essential subject as it helps a doctor know about a drug, its uses, mechanisms in the body, and possible adverse effects of treatment.

The Branches of Pharmacology include

  1. Pharmacokinetcs
  2. Pharmacodynamics
  3. Toxicology
  4. Chemotherapy
  5. Pharmacogenetics
  6. Pharmacotherapeutics

However, for ease of study and specialization, it has further sub-divisions like

  1. General pharmacology
  2. Molecular pharmacology
  3. Neuropharmacology
  4. Cardiovascular pharmacology
  5. Gastrointestinal pharmacology
  6. Psychopharmacology
  7. Immunopharmacology
  8. Respiratory pharmacology
  9. Ocularpharmacology
  10. Dermatological Pharmacology
  11. Musculoskeletal pharmacology
  12. Clinical pharmacology
  13. Veternary pharmacology
Branches_of_Pharmacology

Pharmacokinetcs

This is a division of pharmacology that describes the absorption, distribution, metabolism, and excretion of drugs in the body.

For any given drug, pharmacokinetics are determined for a safe therapy.

Based on it, factors like the dose, dosing schedules, time of administration are determined.

Pharmacodynamics

This is concerned with how to drug acts in the body. Its mechanism of action and other changes it brings in the body after administration.

Every drug molecule is studied extensively for its pharmacodynamics.

Toxicology

Any substance can act as a poison above the suitable doses. Toxicology is the study of this toxic property of the drug.

It evaluates the toxic concentrations, the mechanisms of toxicity, the cells and organs involved in poisonous damage, the metabolism of toxins, and more.

It basically fixes the lethal dose 50% (LD50).

It also mentions the antidotes and methods for the treatment of toxicity.

Every new drug molecule undergoes toxicity research during the new drug development process.

Every new drug molecule undergoes rigorous toxicology tests during the new drug development process.

Chemotherapy

This branch of pharmacology deals with the use of chemicals for the treatment of diseases. It is mainly related use of chemicals to kills microbial parasites and abnormal cells (cancer cells) in the body.

This is of different types like

  • Chemotherapy of protozoans,
  • helminth infections,
  • tuberculosis,
  • cancer.

Pharmacogenetics

This branch relates to the study of the effect of genetic changes on drug therapy across populations.

Pharmacotherapeutics

This is the study of the therapeutic uses of a drug and its effects in the disease condition.

It gives an idea of the symptoms, diagnosis, treatment of a disease, and possible side effects. It has more of a clinical component.

General pharmacology

This deals with the methods of drug absorption, distribution, metabolism, and excretion in detail.

It describes the role of different receptors in the body and their specific ligands.

It also gives an idea of how a drug can act in the body and its possible adverse effects.

Molecular pharmacology

As per NIH, this is the study of molecular actions and interactions of drug therapy. It involves other sciences like molecular biology, biochemistry, toxicology.

Neuropharmacology

This is the study of the drugs that act on the nervous system for various disorders and conditions like anesthesia, epilepsy, Alzheimer’s, parkinsonism, amnesia.

Unlike others, the drugs acting on the nervous system have different pharmacokinetic profiles.

They tend to have higher lipophilic properties.

Cardiovascular pharmacology

This is the study of the drugs acting on the cardiovascular system.

This includes the drugs used for different heart conditions like angina, heart failure, arrhythmias, myasthenia gravis.

It also includes the drug used for the management of hyper and hypotension.

Gastrointestinal pharmacology

Here the drugs acting on the different conditions of the gut are studied like those used for emesis, antiemesis, constipation, diarrhea, hypo chlorosis, acidity, gastric ulcer, fistula, irritable bowel syndrome.

Psychopharmacology

As the name indicates, this covers the drugs used in psychiatric conditions like anxiety, depression, mania, bipolar disorder, schizophrenia, addiction.

Immunopharmacology

Drugs used in immunomodulation and immune suppression are studies here.

Pulmonary pharmacology

This covers the drugs used in the respiratory system disorders like the cough, common cold, asthma, chronic obstructive pulmonary disease.

Some of these drugs are used as aerosols directly besides being administered by oral and parenteral routes.

Ocular pharmacology

The eye is an organ that is anatomically isolated from the circulatory system.

Ocular pharmacology
Structure of the human eye in the skull.

Hence, the pharmacodynamic and pharmacokinetic parameters differ from the rest of the organs.

However, they are directly accessible for drug application.

The drugs used to treat disorders of the eye like glaucoma and other eye-related problems are studied.

Dermatological Pharmacology

The study involves the drugs used in different skin diseases.

Musculoskeletal pharmacology

The drugs used for the treatment of musculoskeletal disorders are studied.

Pharmacoenconomics

This is the study of the cost-effectiveness of drug therapy in comparison to another drug.

It aims to provide optimal healthcare cost-effectively.

Clinical pharmacology

This deals with the implementation of knowledge of pharmacology in clinical practice.

Veternary pharmacology

This is the pharmacology of drugs used for the treatment of animal disorders.

Animals have similar physiology to humans, but they require different doses based on their body mass and metabolic rates.

So, this veterinary pharmacology deals with the pharmacokinetics and pharmacodynamic properties of drugs in animals.

Frequently asked questions and answers

Which area of pharmacology is also called clinical pharmacology

Pharmacotherapeutics is related to clinical pharmacology

What is pharmacological chemistry

Medicinal chemistry is related to pharmacological chemistry.

References

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