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Section 9A
Section 9A

Types of Drugs
Types of Drugs

... Why used: Used to increase heart rate, suppress salivation. -Good aspects: Lasts 2-3 times longer than atropine, less tachycardia, more effective at suppressing salivation, doesn’t cross placental barrier -Bad aspects: Does not treat bradycardia Effects: blocks stimulation of the vagal nerve(increa ...
Xatral (alfuzosin hydrochloride)
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Drug Safety - UK Government Web Archive
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... Inhaled corticosteroids are not licensed for use alone in the treatment of COPD. However, treatment guidelines suggest that regular use of an inhaled corticosteroid (in addition to bronchodilator therapy) can reduce the frequency of exacerbations for patients with severe COPD (ie, FEV1 <50% predicte ...
The Řie-Tozer Model of Drug D
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... where RE/I is the extravascular/intravascular ratio of binding proteins, and VP, VE, and VR refer to the volumes of plasma, extracellular fluid, and remainder fluid, respectively. Both these equations derive from assumptions that the drug molecules in the body are distributed into kinetic pools tha ...
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... than that of Δ9-THC.12 Based on structure-activity relationship studies, DEA previously expected that 5F-APINACA would bind to CB1 receptors as well.12 Like quinolones with adamantyl-carboxamide moieties,15 5F-APINACA has a higher affinity for the CB2 receptor than for the CB1 receptor. Both DEA’s12 ...
Gabapentin Fact Sheet - The Main Line Center for the Family
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... Neurontin (gabapentin) is better known for its use as an anticonvulsant—a medication for treating epilepsy. This may present some confusion for patients, as well as their families, when they are prescribed Neurontin without a history of seizures. Although Neurontin is approved by the U.S. Food and D ...
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a review of pharmacological and pharmaceutical profile of irbesartan
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... that of the angiotensin-converting enzyme (ACE) inhibitors, which also affect the rennin angiotensin system. The ARBs were developed to overcome several of the deficiencies of ACE inhibitors: competitive inhibition of ACE results in a reactive increase in renin and angiotensin I levels, which may ov ...
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...  The transport of a drug to its site of action usually requires passage through several lipid membranes; therefore, membrane permeability has a considerable influence on drug efficacy. In oral drug delivery in particular, which is the preferred route for the majority of drugs, the most common absor ...
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Chapter 3

... • Metabolites of drugs (and sometimes the ...
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Lecture 1- NSAIDs

... Half-life ...
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Drug interaction



A drug interaction is a situation in which a substance (usually another drug) affects the activity of a drug when both are administered together. This action can be synergistic (when the drug's effect is increased) or antagonistic (when the drug's effect is decreased) or a new effect can be produced that neither produces on its own. Typically, interactions between drugs come to mind (drug-drug interaction). However, interactions may also exist between drugs and foods (drug-food interactions), as well as drugs and medicinal plants or herbs (drug-plant interactions). People taking antidepressant drugs such as monoamine oxidase inhibitors should not take food containing tyramine as hypertensive crisis may occur (an example of a drug-food interaction). These interactions may occur out of accidental misuse or due to lack of knowledge about the active ingredients involved in the relevant substances.It is therefore easy to see the importance of these pharmacological interactions in the practice of medicine. If a patient is taking two drugs and one of them increases the effect of the other it is possible that an overdose may occur. The interaction of the two drugs may also increase the risk that side effects will occur. On the other hand, if the action of a drug is reduced it may cease to have any therapeutic use because of under dosage. Notwithstanding the above, on occasion these interactions may be sought in order to obtain an improved therapeutic effect. Examples of this include the use of codeine with paracetamol to increase its analgesic effect. Or the combination of clavulanic acid with amoxicillin in order to overcome bacterial resistance to the antibiotic. It should also be remembered that there are interactions that, from a theoretical standpoint, may occur but in clinical practice have no important repercussions.The pharmaceutical interactions that are of special interest to the practice of medicine are primarily those that have negative effects for an organism. The risk that a pharmacological interaction will appear increases as a function of the number of drugs administered to a patient at the same time.It is possible that an interaction will occur between a drug and another substance present in the organism (i.e. foods or alcohol). Or in certain specific situations a drug may even react with itself, such as occurs with dehydration. In other situations, the interaction does not involve any effect on the drug. In certain cases, the presence of a drug in an individual's blood may affect certain types of laboratory analysis (analytical interference).It is also possible for interactions to occur outside an organism before administration of the drugs has taken place. This can occur when two drugs are mixed, for example, in a saline solution prior to intravenous injection. Some classic examples of this type of interaction include that Thiopentone and Suxamethonium should not be placed in the same syringe and same is true for Benzylpenicillin and Heparin. These situations will all be discussed under the same heading due to their conceptual similarity.Drug interactions may be the result of various processes. These processes may include alterations in the pharmacokinetics of the drug, such as alterations in the absorption, distribution, metabolism, and excretion (ADME) of a drug. Alternatively, drug interactions may be the result of the pharmacodynamic properties of the drug, e.g. the co-administration of a receptor antagonist and an agonist for the same receptor.
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