Pharmacology is a science that studies the effect of a drug and the body’s response to it. It is aimed at bringing therapeutic benefits from the drug.
Toxicology is the science that studies the toxic properties of substances and their adverse effects on living beings.
But, in areas like drug research, both pharmacology and toxicology are employed. However, the roles of these two studies are different yet vital.
Pharmacology vs Toxicology Differences
Since both studies are utilized in drug research, there is a chance of confusion, and it would be important to know the differences and similarities. But before we go further, we need to be clear about the terms “toxin and medicine.”
Poison/ toxin: Any substance beyond a certain dose acts as a poison to living beings. This is true for even the water we drink and the oxygen we inhale.
Drug or medicine: Any substance that is intended to treat, cure, diagnose, or prevent a disease or body discomfort is called a drug.
So, from the above terms, it is clear that all substances can act as poisons, but only a few of them can act as medicines.
| Sl. No | Character | Pharmacology | Toxicology |
|---|---|---|---|
| 1. | Aim | To ascertain the efficacy and compatibility of the drug in the treatment of disease. | The lethal dose 50 (LD50), and lethal concentration 50 (LC50) are determined. |
| 2. | Parameters | The effective dose (ED 50), the volume of distribution, clearance rate, half-life ( t1⁄2), etc. | The lethal dose 50 (LD50), lethal concentration 50 (LC50) are determined. |
| 3. | Subjects for study | Studies are done on both animals and humans. But they are alive | Studies are confined mostly to animals. But for forensic purposes, it is done even on dead bodies. |
| 4. | Substances tested | Medicines, devices, vaccines. | Any substance that can have an effect on living organisms. |
| 5. | Point of studies | It is done after toxicological studies. | It is done prior to pharmacological studies to minimize the chances of adverse effects in humans and animals. |
| 6. | Range of studies | It is done at different levels, such as preclinical and clinical studies. | It is done as acute, subacute, and chronic toxicity studies. |
| 7. | Scale of studies | It is done on a small scale, like in hundreds or thousands of subjects. | It is continued on a large scale, across thousands or millions of subjects (clinical trials 3 and 4) to assess adverse effects on the whole population. |
| 8. | Reports | The minimum dose is required to produce a therapeutic effect. | The maximum tolerable dose without toxic effects is determined. |
| 9. | End goal | To restore health and well-being in a safe manner. | To preserve and protect the health of humans and the environment. |
| 10. | Branches | It has two main branches: pharmacokinetics and pharmacodynamics. | Different branches like medical toxicology, environmental toxicology, forensic toxicology, etc. |
Pharmacology vs. Toxicology: Similarities in Medicine
There are a few similarities when seen in medical studies, like
| Sl. NO | Feature | Pharmacology | Toxicology |
|---|---|---|---|
| 1 | Animals used | Albino Rats, mice, guinea pigs, etc. | The same set of animals is used for toxicology, too. |
| 2 | Method of administration | Oral or parenteral administrations | The method of administration is the same as in pharmacology. |
| 3 | Mode of study | Screening method | It is also a screening test. |
| 4 | Substance’s state or form | It can be a solid, liquid, gas, powder, crystalline, or amorphous. | The same form of the substance is used for both studies when a particular medicine is screened. |
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What is the dose in toxicology?
The dose at which a substance shows adverse effects is the toxic dose. LD50 or LC50 determines this.
Are toxicology and pharmacology the same
You could make out from the above differences that they are not the same. But both are needed for adequate healthcare.
