Drug Deposition Rate
Drug Deposition Rate - Related Videos
01:22
Renal Drug Excretion: Effect of Urine pH, Flow Rate, and Drug pKa
0 Views •
2025
The pH of urine, the drug's pKa, and the urine flow rate are vital parameters for drug reabsorption and excretion. Urinary pH varies between 4.6 and 8.0 and is influenced by diet, drug intake, and the patient's pathophysiology. It affects a drug's ionization state and reabsorption. For instance, carbohydrate-rich food produces alkaline urine promoting drug excretion, while proteins and certain medications like ascorbic acid lead to acidic urine enhancing reabsorption. The pKa of a drug,...
08:23
Niobium Oxide Films Deposited by Reactive Sputtering: Effect of Oxygen Flow Rate
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Cited by 8 •
2019
Here, we present a protocol for niobium oxide films deposition by reactive sputtering with different oxygen flow rates for use as an electron transport layer in perovskite solar cells.
01:15
Factors Affecting Drug Distribution: Organ Perfusion Rate
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2025
Drug distribution within the body is a complex process influenced by several factors, including perfusion rate, the rate at which the bloodstream transports drugs to tissue. This limitation becomes particularly significant when dealing with highly lipophilic drugs. In such cases, the rate at which the drug can move across membranes is crucial, and if the membrane is highly permeable to the drug, distribution becomes rate-limited by perfusion. Perfusion rate-limited distribution relies on the...
02:33
Phase Transitions: Sublimation and Deposition
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2020
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
02:53
Reaction Rate
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2020
The rate of reaction is the change in the amount of a reactant or product per unit time. Reaction rates are therefore determined by measuring the time dependence of some property that can be related to reactant or product amounts. Rates of reactions that consume or produce gaseous substances, for example, are conveniently determined by measuring changes in volume or pressure. The mathematical representation of the change in the concentration of reactants and products, over time, is the rate...
FAQs
Particle size and airflow determine where drug-containing particles are likely to travel and impact. Their interaction can favor retention in the mouth or throat, delivery into the lungs, or exhalation without deposition. Consequently, changing these variables can alter the amount reaching the intended site, making them central to formulation and inhalation-delivery optimization.
Breathing pattern changes the movement of inhaled particles through the airways, while airway anatomy changes the paths and surfaces they encounter. Together, these factors can shift deposition among the mouth, throat, and lungs, or increase the fraction exhaled. Accounting for both is therefore necessary when interpreting why the same formulation produces different deposition outcomes.
Formulation is a controllable variable because it affects how drug-containing particles behave during inhalation. A formulation can therefore change the fraction reaching the lungs versus remaining in the mouth or throat, which in turn influences local exposure, possible systemic concentrations, and off-target effects. Formulation comparisons help identify designs that provide the intended distribution.
Deposition in the mouth, throat, or lungs identifies the anatomical destination of the dose, while exhalation indicates that the particles did not remain in the airways. These location-specific results help researchers estimate local exposure, consider potential systemic concentrations, and detect distribution that may contribute to unwanted off-target effects.
Researchers evaluate it by measuring where and how much medication accumulates, then comparing those results across formulations. The comparison indicates whether a product directs exposure toward the intended site or leaves more drug in the mouth, throat, or exhaled fraction. Such evidence supports formulation selection and assessment of efficacy and safety.
Controlling Drug Deposition Rate helps developers shape both the timing and location of exposure. For inhaled treatments, this supports optimization of lung delivery and reduction of unwanted deposition. The same principle extends to other dosage forms when precise spatial and temporal drug distribution is required, helping researchers design delivery approaches suited to their intended biological targets.