Osmotic drug delivery systems typically consist of a drug core containing osmogen that is coated with a semipermeable membrane. This coating has one or more delivery ports through which a solution or suspension of the drug is released over time.
What are the basic components of osmotic pump?
These systems are used for both oral administration and implantation. Osmotic pumps consist of an inner core containing drug and osmogens, coated with a semipermeable membrane. As the core absorbs water, it expands in volume, which pushes the drug solution out through the delivery ports.
What is osmotic system?
An osmotic system is one in which the key substance moves down a solute concentration gradient across a semipermeable membrane. Such a membrane allows water to move through its pores freely, but not the solute. The water is drawn across the membrane by the difference in solute concentration on either side.
What are characteristics of osmotic pressure control system?
Explanation: Osmotic pressure-controlled systems works on the principle of osmotic pressure to release the drug at a constant zero order rate. The core of the system comprises of the drug and osmotically active substance which will be surrounded by a rigid semipermeable membrane coating.
Which is an osmotic drug?
Osmotic pumps are most promising systems for controlled drug delivery. Osmotic pumps consist of an inner core containing drug and osmogens, coated with a semipermeable membrane. As the core absorbs water, it expands in volume, which pushes the drug solution out through the delivery ports.
What is Bioadhesion and Mucoadhesion?
Bioadhesion (and mucoadhesion) is the process whereby synthetic and natural macromolecules adhere to mucosal surfaces in the body. If these materials are then incorporated into pharmaceutical formulations, drug absorption by mucosal cells may be enhanced or the drug released at the site for an extended period of time.
What is zero order drug release?
Abstract: Zero-order release, in which a drug is released at a constant rate, is the ultimate goal of all controlled-release drug-delivery mechanisms.
What is osmosis in pharmacy?
Osmotic drug delivery is the controlled delivery of an oral drug through the use of osmotic pressure. Osmosis causes water to be absorbed through the semi-permeable membrane, resulting in osmotic pressure that then pushes the active drug out of the pill through the drilled hole(s).
How osmotic pressure can regulate drug release rate?
One way to control drug release is by using osmotic systems, which operate on the principles of osmosis (i.e., the movement of solvent through a semipermeable membrane into a region of higher solute concentration until the solute concentrations are equal on both sides of the membrane).
What are osmotic agents?
Osmotic agents are osmotically active ions or molecules that are poorly absorbed by the intestine and thereby obligate water retention intralumenally to maintain isotonicity with plasma.
What is bioadhesive and mucoadhesive drug delivery system?
For drug delivery purposes, the term bioadhesion implies attachment of a drug carrier system to a specified biological location. Mucoadhesion should not be confused with bioadhesion; in bioadhesion, the polymer is attached to the biological membrane and if the substrate is mucus membrane the term mucoadhesion is used.
What are the different types of bioadhesion?
Examples of bioadhesives in nature
- Colonization of surfaces (e.g. bacteria, algae, fungi, mussels, barnacles, rotifers)
- Mussel’s byssal threads.
- Tube building by polychaete worms, which live in underwater mounds.
- Insect egg, larval or pupal attachment to surfaces (vegetation, rocks), and insect mating plugs.
What is osmotic drug delivery?
Osmotic drug delivery has come a pump in 1955. desirable) is achievable with osmotic systems. Delivery may be delayed or pulsed, if desired. coating of osmotic formulations. artificial gastric and intestinal fluid. The release profile for both media are similar and not affected by pH. systems.
What is osmosis in pharmacology?
Ideal drug delivery system should Osmosis is defined as the process of movement of sol- steadily deliver a measurable and reproducible amount of vent molecules from lower concentration to higher concen- drug to the target site over a prolonged period. Controlled tration across a semi-permeable membrane.
What are the components of an osmotic pump?
Basic Component of Osmotic Pumps: There are three major components of osmotic pumps: drug, osmotic agent and semi permeable membrane.
What is the solubility of monolithic osmotic tablets?
Monolithic osmotic tablets containing a solid dispersion for practically insoluble drug nifedipine [22] and 10-hydroxycamptothecin [23] were formulated to get near zero order release for 24 hrs. For ionic drugs, an alternative salt form can be used, as reported for metoprolol fumarate salt have optimum solubility [4, 24].
