What does oxidation do to a drug?
The main chemical reactions that affect the stability of a drug are oxidation and hydrolysis. Oxidation involves the removal of electrons from a molecule (or the addition of oxygen) and such reactions can be initiated by light, heat or certain trace metals.
What is oxidative Dealkylation?
O-dealkylation: In the first step, the enzyme removes a hydrogen atom from the carbon adjacent to the oxygen (Hydrogen atom transfer, HAT), to generate a neutral carbon radical. Hydroxyl recombination follows in the second step to form a hemiacetal intermediate.
What drugs have toxic metabolites?
Another example of toxic metabolites comes in the commonly used pain relief and antipyretic medication acetaminophen, also known as paracetamol, which is extensively metabolized in the liver.
What are the ways to protect drugs from oxidation?
- 2.5. Prevention of oxidative deterioration.
- 2.5.1. Exclusion of oxygen.
- 2.5.2. Use of amber or coloured glass containers.
- 2.5.3. Use of chelating agents.
- 2.5.4. Use of antioxidants.
Which drugs cause oxidative stress?
The data of the present study using assay methods in the presence and absence of cells suggest that nimustine, actinomycin D, doxorubicin, mitomycin C, mitoxantrone, carmofur, gemcitabine, mercaptopurine, camptothecin, paclitaxel, vinblastine, and vinorelbine are able to induce oxidative stress.
What does N Dealkylation do?
N-Dealkylation is a frequently encountered metabolic reaction. It is often responsible for the production of the major metabolite obtained from an N-alkyl containing drug.
What causes drug toxicity?
Drug toxicity can occur as a result of the over-ingestion of medication, causing too much of the drug to be in a person’s system at once. 1 This can happen if the dose taken exceeds the prescribed amount, or if the prescribed dosage is too high.
What is metabolic toxicity?
Metabolism plays a central role in regulating the toxicity of a variety of chemicals. Relatively innocuous substances can be converted to highly toxic metabolites. Conversely, toxic substances can be biotransformed to less harmful metabolites or be excreted, thus limiting their duration of biological action.
What are oxidant drugs?
Oxidants
| Drug | Drug Description |
|---|---|
| Hypochlorite | An antimicrobial used to treat and prevent infections of the skin and tissue. |
| Carbamide peroxide | A medication used to loosen ear wax, whiten teeth, and clean oral wounds. |
| Ozone | Ozone has been used in trials studying the treatment of Mild Asthma and Primary Apical Periodontite. |
Do all drugs undergo Phase 1 and Phase 2 metabolism?
Some drugs undergo either phase 1 or phase 2 metabolism, but most undergo phase 1 metabolism followed by phase 2 metabolism.
What does glucuronidation do to drugs?
Glucuronidation is a well-characterized phase II metabolic pathway that has high capacity and provides rapid drug inactivation via the polar glucuronide metabolites produced.
Which drugs are metabolized by glucuronidation?
Oxazepam and lorazepam are mainly metabolized by glucuronidation. Anti-epileptics with mood-stabilizing properties are frequently metabolized by UGTs. Opioid and nicotine addiction may also be influenced by glucuronidation.
What are the 5 mechanisms of the drug toxicity?
Just as toxicity can be classified into four classes on the basis of its pathological effect, major drug toxicities can be grouped into five categories in terms of the mechanism underlying toxicity: ON-TARGET, or mechanism-related, toxicity; hypersensitivity and related immunological reactions; OFF-TARGET PHARMACOLOGY; …
What affects drug toxicity?
The main factors are disease, genetics, and age. Nutritional status, sex, hormonal status (e.g., the effects of pregnancy), and circadian rhythm have important influences. Maternal toxicity will affect the fetus. The absorption and excretion of drugs are frequently reduced by diseases.