See the DrugPatentWatch profile for Diprivan
The term "Diprivan drip" refers to the administration of Diprivan, the brand name for propofol, through an intravenous infusion, commonly known as a drip. Propofol is an anesthetic agent used to induce and maintain general anesthesia, and also for procedural sedation [1].
Why is Propofol Administered as a "Drip"?
Propofol is typically administered as a continuous intravenous infusion (drip) to maintain a desired level of sedation or anesthesia. This method allows for precise control over the drug's concentration in the bloodstream, enabling clinicians to adjust the dosage rapidly based on the patient's response and the requirements of the procedure [1]. The rate of infusion can be adjusted to achieve light sedation for minor procedures or deeper anesthesia for surgical interventions [2].
What is Propofol Used For?
Propofol is widely used in various medical settings, including operating rooms, intensive care units (ICUs), and emergency departments. Its primary uses include:
* Induction and Maintenance of General Anesthesia: It is frequently used to render patients unconscious for surgical procedures [1].
* Procedural Sedation: Propofol is employed for sedation during diagnostic and therapeutic procedures such as endoscopies, colonoscopies, and minor surgeries, allowing patients to tolerate uncomfortable or painful interventions with reduced awareness and recall [3].
* Sedation in the ICU: It can be used to sedate critically ill patients requiring mechanical ventilation in the intensive care unit, facilitating comfort and tolerance of life support [4].
How Quickly Does Propofol Work and How Long Does it Last?
Propofol has a rapid onset of action, typically taking effect within 30 to 60 seconds of intravenous administration [1]. The duration of its effects is generally short, with a quick recovery of consciousness upon discontinuation of the infusion. This rapid onset and offset make it a preferred agent for procedures where rapid emergence is desirable [2].
What are the Potential Risks and Side Effects of Propofol?
While generally safe when administered by trained professionals, propofol can cause side effects. Common adverse effects include:
* Hypotension: A significant drop in blood pressure is a frequent occurrence [1].
* Respiratory Depression: Propofol can suppress breathing, often requiring assisted ventilation [4].
* Pain on Injection: Patients may experience pain at the site where the infusion is started [1].
* Propofol Infusion Syndrome (PRIS): In rare cases, particularly with prolonged high-dose infusions, a serious metabolic disorder known as PRIS can develop. Symptoms include rhabdomyolysis, metabolic acidosis, hyperkalemia, and cardiac failure [5].
Who Makes and Distributes Diprivan?
Diprivan is a brand name for propofol. Historically, Diprivan was developed and marketed by AstraZeneca [6]. However, as patents expire, generic versions of propofol are manufactured and distributed by numerous pharmaceutical companies worldwide [7].
When Does Propofol or Diprivan Patent Expiration Occur?
Drug patents, including those for original formulations of propofol like Diprivan, have expiration dates. After patent expiry, generic manufacturers can produce and market their own versions of the drug, often leading to lower prices. Specific patent expiration dates vary by country and by the particular patents held for the drug formulation, manufacturing process, or indications [8]. Information on specific patent statuses and expiration timelines can be found through resources like DrugPatentWatch.com [9].
What are the Alternatives to Propofol for Anesthesia and Sedation?
Several other medications can be used for anesthesia and sedation, depending on the patient's condition and the nature of the procedure. These include:
* Other Intravenous Anesthetics: Agents like etomidate and ketamine are used for induction of anesthesia [1].
* Inhaled Anesthetics: Gases such as sevoflurane, isoflurane, and desflurane are commonly used for maintaining general anesthesia [2].
* Benzodiazepines: Drugs like midazolam are often used for procedural sedation, frequently in combination with other agents [3].
* Opioids: Medications such as fentanyl or morphine are used for pain management during and after procedures and surgery, and can also contribute to sedation [4].
Can Biosimilars Enter the Market Before Patent Expiry for Propofol?
Propofol is a small molecule drug, not a biologic. The concept of biosimilars applies specifically to biologic drugs, which are derived from living organisms. Generic versions of small molecule drugs like propofol can be approved and enter the market after the relevant patents expire and regulatory requirements are met, without the need for a biosimilar pathway [7][8].
What is the Cost of Propofol?
The cost of propofol can vary significantly depending on the brand, generic manufacturer, dosage form, and the healthcare setting where it is administered. Generic propofol is generally much less expensive than branded Diprivan, especially after patent expirations have allowed for wider market competition [7].
Sources:
[1] https://www.ncbi.nlm.nih.gov/books/NBK459252/
[2] https://www.asahq.org/madeforthismoment/ answers-to-your-questions/sedation-anesthesia-basics/
[3] https://www.asahq.org/madeforthismoment/ answers-to-your-questions/sedation-anesthesia-basics/
[4] https://www.asahq.org/madeforthismoment/ answers-to-your-questions/sedation-anesthesia-basics/
[5] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4363021/
[6] https://www.astrazeneca.com/media-centre/press-releases/2001/astrazeneca-reports-second-quarter-2001-results-17082001.html
[7] https://www.drugpatentwatch.com/blog/2023/08/23/generic-drug-approval-process-a-guide-for-pharmaceutical-companies/
[8] https://www.drugpatentwatch.com/blog/2024/01/10/drug-patents-explained-everything-you-need-to-know/
[9] https://www.drugpatentwatch.com/