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The primary objective of pharmacology is to benefit the patient by understanding the properties and actions of drugs, while also considering the potential risks and toxicities associated with their use.
Factors to consider include the desired therapeutic effect, the individual characteristics and state of the patient, and the physicochemical properties of the drug and its pharmaceutical forms.
Local action, also known as topical action, does not enter the bloodstream and acts only at the site of application, such as the skin or mucous membranes. Systemic action occurs after the drug has been absorbed into the bloodstream and exerts effects throughout the body.
The two main branches of pharmacology are pharmacodynamics, which studies the effects and actions of drugs on the body, and pharmacokinetics, which examines how the body affects a drug, including its absorption, distribution, metabolism, and excretion.
Pharmacotherapeutics is the branch of pharmacology that studies the application of drugs in humans, focusing on the therapeutic effects and clinical use of medications.
Pharmacotoxicology is the study of the harmful effects of drugs, including the conditions and mechanisms that lead to toxicity and adverse reactions.
The skin can be used for systemic treatments through transdermal drug delivery systems, such as patches, which allow drugs to be absorbed through the skin into the bloodstream.
Advantages include avoiding first-pass metabolism, achieving stable plasma drug levels, improving therapeutic compliance, allowing for immediate cessation of drug administration, reducing undesirable effects and drug-food interactions, and enabling the use of drugs with short half-lives.
Limitations include the fact that not all drugs can be administered transdermally, especially those requiring high doses, and the potential for skin irritation or sensitization. Only lipophilic drugs with small molecular weights can effectively penetrate the stratum corneum.
Factors include the integrity of the skin, the duration of treatment, the use of occlusive dressings, body temperature, and the degree of hydration of the skin.
The topical route involves applying medications directly to the skin or mucous membranes, where they can exert local effects or be absorbed into the systemic circulation.
The otic route involves administering small amounts of medication into the ear canal for local effects, such as softening cerumen or treating infections, pain, or inflammation.
The nasal route involves delivering medications through the nasal mucosa, allowing for rapid absorption into the systemic circulation and providing local effects.
The ophthalmic route involves applying medications directly to the eyes, typically in the form of drops or ointments, to treat local conditions such as infections or inflammation.
Evaluating the benefit-risk ratio is crucial to ensure that the therapeutic benefits of a drug outweigh its potential risks and toxicities for each individual patient.
Drug formulation is significant because it affects the drug's stability, absorption, and overall effectiveness, influencing how the drug is delivered and how it acts in the body.
The first-pass effect refers to the metabolism of a drug by the liver before it reaches systemic circulation, which can significantly reduce the bioavailability of orally administered drugs.
Excipients are inactive substances used in drug formulations to aid in the manufacturing process, improve stability, enhance absorption, and facilitate drug delivery.
Patient characteristics, such as age, weight, gender, genetic factors, and existing health conditions, are important in drug therapy as they can influence drug metabolism, efficacy, and safety.
Drug interactions can lead to altered drug efficacy, increased toxicity, or unexpected side effects, making it essential to consider all medications a patient is taking.
Compliance can be improved through patient education, simplifying dosing schedules, using long-acting formulations, and addressing barriers to adherence.
Pharmacovigilance is the science of monitoring the safety of drugs after they have been approved for use, aiming to identify and evaluate adverse effects and ensure patient safety.