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Comparison of Pharmacology and Toxicology
Objectives ,[object Object],[object Object],[object Object],[object Object]
Definitions ,[object Object],[object Object],[object Object],[object Object],[object Object]
Dose ,[object Object],[object Object],[object Object],[object Object]
Key Factors Related to Dose ,[object Object],[object Object]
Administration/Exposure ,[object Object],[object Object],[object Object],[object Object]
Key Factors Related to Administration/Exposure ,[object Object],[object Object],[object Object]
Routes of Administration/Exposure ,[object Object],[object Object],[object Object],[object Object]
Key Factors Related to Routes of Administration/Exposure ,[object Object],[object Object]
Distribution, Metabolism and Excretion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Dose-Response Curve ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Dose-Response Curve ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Key Factors Related to Dose Response ,[object Object],[object Object]
Responses - Pharmacology ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Responses -  Toxicology ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Toxicity ,[object Object]
Key Factors Related to Toxicity ,[object Object],[object Object]
Interactions ,[object Object],[object Object],[object Object],[object Object]
Interactions, continued ,[object Object],[object Object],[object Object],[object Object]
Potency ,[object Object],[object Object],[object Object],[object Object]
Biological Monitoring ,[object Object],[object Object],[object Object],[object Object]
The Regulatory Process ,[object Object],[object Object]
Resources for Further Information ,[object Object],[object Object],[object Object],[object Object],[object Object]
Resources, continued ,[object Object],[object Object]
Resources, continued ,[object Object],[object Object],[object Object]

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Comparison of Pharmacology and Toxicology

Editor's Notes

  1. You are all familiar with the key principles of pharmacology from ( names of courses ). Today we’re going to talk about a branch of science called toxicology. Toxicology is very important to understanding the effects of environmental pollutants on human health. It is also similar to pharmacology, and we’re going to be comparing these two disciplines (toxicology and pharmacology) throughout this lecture.
  2. In pharmacology, we have very good control over who receives what dosage of what substance (as described by the 5 “R”s: you are responsible for giving the right medication, to the right patient, in the right dose, at the right time, by the right route). In environmental health, though, it is usually very difficult to control or determine who receives what dose of which toxin(s). For environmental exposures, we are often left “reconstructing” a dose based on the best information we can gather.
  3. Drugs are taken voluntarily, often under the supervision of a licensed health care provider…. Children are at high risk for poisoning from drugs and hazardous chemicals because of their curiosity and hand-to-mouth behavior. With regard to environmental hazards, children are at greater risk because they spend more time on or near the ground, which increases their exposure to residues (including residues from airborne toxicants that settle on the ground). With regard to foodborne toxicants, children have greater food intake per kilogram of body weight than adults, and they eat a smaller range of foods (which leads to increased risk from contaminants on certain foods). With regard to airborne toxicants, children breathe proportionately more air than adults.
  4. In administration of medication, different routes are used based upon the efficacy of absorption of drugs from each route . For example, the topical route can be used only for medication preparations that are absorbed effectively through the skin. Insulin is administered parenterally because it is broken down in the stomach and, therefore, is not absorbed well via the GI tract. In environmental health, different toxins are absorbed through different routes of exposure, which results in variations in toxicity . For example, elemental mercury (the silver-grey material in mercury thermometers and sphygmomanometers) is poorly absorbed through the GI tract but well absorbed as a vapor in the respiratory tract. If transformed to methylmercury by the action of bacteria in bodies of water, and later consumed in fish, it is readily absorbed in the GI tract and crosses the placental barrier.
  5. Distribution refers to the organs that are reached by the drug or toxin. Metabolism is the chemical transformation of the substance that occurs. Metabolism produces products called metabolites , which may be more or less toxic than the original substance. Excretion refers to the elimination of the substance, usually by way of the kidneys.
  6. Beyond a certain dose (the threshold), the response increases with increasing dose. At some point, this effect may “level off.”
  7. In pharmacology as well as environmental health, the dose-response curve may differ for different populations . Children, for example, are not just little adults. Because of differences in development and function of organs, they may metabolize drugs or toxins differently from adults. Therefore, effects may increase for children at lower (or occasionally higher) doses. For example, children absorb lead from the GI tract much more efficiently than adults. With nitrate in drinking water, the higher pH in the digestive system of an infant allows proliferation of bacteria which transform nitrate into toxic nitrite. In pharmacology as well as environmental health, individuals vary with regard to response to drugs or toxins. This is due to factors such as: age, gender, genetic variations, weight, drug that the person may be taking, pregnancy status.
  8. At low doses or concentrations, there is no observable response (dose is subtherapeutic ). With increased dosage , there are therapeutic responses (which are desirable) and side effects (which are generally undesirable). Beyond the therapeutic dose , a drug may become toxic. (Note: The graph on this slide is a “compressed” representation of therapeutic and toxic responses. Actually, there is an S curve for each effect (therapeutic or toxic). Generally, though, toxic effects occur at higher doses—ideally, at doses that exceed those required for maximal therapeutic effect.)
  9. In toxicology, only the toxic effects are of concern. At low doses, there may be no effect (called NOEL – no observable effect level ). At levels greater than NOEL, toxicity occurs.
  10. With medications, side effects sometimes result from long-term use of the drug (for example, gastric ulcers from non-steroidal anti-inflammatory drugs [NSAID’s]). In environmental health, chronic exposure may result in effects that are quite different from the effects of single larger exposures that result in acute symptoms. These chronic exposures often result in neurological effects or cancer.
  11. Toxicological interactions include interactions between drugs and environmental pollutants.
  12. These effects may be additive (the sum of the effects = the whole , or the total toxicity of the two)…….
  13. In pharmacology, clotting time is monitored in patients on anticoagulants like coumadin. Actual drug levels are measured for some drugs like digoxin. In environmental health, blood lead levels, or metabolites of chemicals such as cotines for environmental tobacco smoke, may be monitored.
  14. When testing is done, it tends to be focused on the effects on middle-aged white males. In recent years (notably with the Food Quality Protection Act of 1996), the effects on children have begun to be taken into consideration.