Oxycodone is a pure agonist opioid whose principal therapeutic action is analgesia. Other members of the class known as opioid agonists include substances such as morphine, hydromorphone, fentanyl, codeine, and hydrocodone. Pharmacological effects of opioid agonists include anxiolysis, euphoria, feelings of relaxation, respiratory depression, constipation, miosis, and cough suppression, as well as analgesia. Like all pure opioid agonist analgesics, with increasing doses there is increasing analgesia, unlike with mixed agonist/antagonists or non-opioid analgesics, where there is a limit to the analgesic effect with increasing doses. With pure opioid agonist analgesics, there is no defined maximum dose; the ceiling to analgesic effectiveness is imposed only by side effects, the more serious of which may include somnolence and respiratory depression.
Central Nervous System
The precise mechanism of the analgesic action is unknown. However, specific CNS opioid receptors for endogenous compounds with opioid-like activity have been identified throughout the brain and spinal cord and play a role in the analgesic effects of this drug.
Oxycodone produces respiratory depression by direct action on brain stem respiratory centers. The respiratory depression involves both a reduction in the responsiveness of the brain stem respiratory centers to increases in carbon dioxide tension and to electrical stimulation.
Oxycodone depresses the cough reflex by direct effect on the cough center in the medulla. Antitussive effects may occur with doses lower than those usually required for analgesia.
Oxycodone causes miosis, even in total darkness. Pinpoint pupils are a sign
of opioid overdose but are not pathognomonic (e.g., pontine lesions of hemorrhagic or ischemic origin may produce similar findings). Marked mydriasis rather than
miosis may be seen with hypoxia in the setting of OxyContin® overdose (See
OVERDOSAGE).
Gastrointestinal Tract And Other Smooth Muscle
Oxycodone causes a reduction in motility associated with an increase in smooth muscle tone in the antrum of the stomach and duodenum. Digestion of food in the small intestine is delayed and propulsive contractions are decreased. Propulsive peristaltic waves in the colon are decreased, while tone may be increased to the point of spasm resulting in constipation. Other opioid-induced effects may include a reduction in gastric, biliary and pancreatic secretions, spasm of sphincter of Oddi, and transient elevations in serum amylase.
Cardiovascular System
Oxycodone may produce release of histamine with or without associated peripheral vasodilation. Manifestations of histamine release and/or peripheral vasodilation may include pruritus, flushing, red eyes, sweating, and/or orthostatic hypotension.
Concentration – Efficacy Relationships
Studies in normal volunteers and patients reveal predictable relationships between oxycodone dosage and plasma oxycodone concentrations, as well as between concentration and certain expected opioid effects, such as pupillary constriction, sedation, overall “drug effect”, analgesia and feelings of “relaxation”.
As with all opioids, the minimum effective plasma concentration for analgesia will vary widely among patients, especially among patients who have been previously treated with potent agonist opioids. As a result, patients must be treated with individualized titration of dosage to the desired effect. The minimum effective analgesic concentration of oxycodone for any individual patient may increase over time due to an increase in pain, the development of a new pain syndrome and/or the development of analgesic tolerance.
Concentration – Adverse Experience Relationships
OxyContin® Tablets are associated with typical opioid-related adverse experiences. There is a general relationship between increasing oxycodone plasma concentration and increasing frequency of dose-related opioid adverse experiences such as nausea, vomiting, CNS effects, and respiratory depression. In opioid-tolerant patients, the situation is altered by the development of tolerance to opioid-related side effects, and the relationship is not clinically relevant.
As with all opioids, the dose must be individualized (see DOSAGE AND ADMINISTRATION),
because the effective analgesic dose for some patients will be too high to be
tolerated by other patients.
Pharmacokinetics And Metabolism
The activity of OxyContin Tablets is primarily due to the parent drug oxycodone. OxyContin Tablets are designed to provide controlled delivery of oxycodone over 12 hours.
Breaking, chewing or crushing OxyContin Tablets eliminates the controlled delivery mechanism and results in the rapid release and absorption of a potentially fatal dose of oxycodone.
Oxycodone release from OxyContin Tablets is pH independent. Oxycodone is well absorbed from OxyContin Tablets with an oral bioavailability of 60% to 87%. The relative oral bioavailability of OxyContin to immediate-release oral dosage forms is 100%. Upon repeated dosing in normal volunteers in pharmacokinetic studies, steady-state levels were achieved within 24-36 hours. Dose proportionality and/or bioavailability has been established for the 10 mg, 20 mg, 40 mg, 80 mg, and 160 mg tablet strengths for both peak plasma levels (Cmax) and extent of absorption (AUC). Oxycodone is extensively metabolized and eliminated primarily in the urine as both conjugated and unconjugated metabolites. The apparent elimination half-life of oxycodone following the administration of OxyContin® was 4.5 hours compared to 3.2 hours for immediate-release oxycodone.
Absorption
About 60% to 87% of an oral dose of oxycodone reaches the central compartment in comparison to a parenteral dose. This high oral bioavailability is due to low pre-systemic and/or first-pass metabolism. In normal volunteers, the t˝ of absorption is 0.4 hours for immediate-release oral oxycodone. In contrast, OxyContin Tablets exhibit a biphasic absorption pattern with two apparent absorption half-lives of 0.6 and 6.9 hours, which describes the initial release of oxycodone from the tablet followed by a prolonged release.
Plasma Oxycodone by Time
Dose proportionality has been established for the 10 mg, 20 mg, 40 mg, and
80 mg tablet strengths for both peak plasma concentrations (Cmax) and extent
of absorption (AUC) (see Table 1 below). Another study established that
the 160 mg tablet is bioequivalent to 2 x 80 mg tablets as well as to 4 x 40
mg for both peak plasma concentrations (Cmax) and extent of absorption (AUC)
(see Table 2 below). Given the short half-life of elimination of oxycodone
from OxyContin®, steady-state plasma concentrations of oxycodone are achieved
within 24-36 hours of initiation of dosing with OxyContin Tablets. In a study
comparing 10 mg of OxyContin every 12 hours to 5 mg of immediate-release oxycodone
every 6 hours, the two treatments were found to be equivalent for AUC and Cmax,
and similar for Cmin (trough) concentrations.
Plasma Oxycodone By Time
TABLE 1: Mean [% coefficient variation]
| Regimen |
Dosage Form |
AUC (ng•hr/mL)† |
Cmax (ng/mL) |
Tmax (hrs) |
Trough Conc. (ng/mL) |
| Single Dose |
10 mg OxyContin |
100.7 [26.6] |
10.6 [20.1] |
2.7 [44.1] |
n.a. |
| 20 mg OxyContin |
207.5 [35.9] |
21.4 [36.6] |
3.2 [57.9] |
n.a. |
| 40 mg OxyContin |
423.1 [33.3] |
39.3 [34.0] |
3.1 [77.4] |
n.a. |
| 80 mg OxyContin* |
1085.5 [32.3] |
98.5 [32.1] |
2.1 [52.3] |
n.a. |
| Multiple Dose |
10 mg OxyContin Tablets q12h
5 mg immediate-release q6h |
103.6 [38.6] |
15.1 [31.0] |
3.2 [69.5] |
7.2 [48.1] |
| 99.0 [36.2] |
15.5 [28.8] |
1.6 [49.7] |
7.4 [50.9] |
TABLE 2: Mean [% coefficient variation]
| Regimen |
Dosage Form |
AUC∞ (ng•hr/mL)†
|
Cmax (ng/mL) |
Tmax (hrs) |
Trough Conc. (ng/mL) |
| Single Dose |
4 x 40 mg OxyContin* |
1935.3 [34.7] |
152.0 [28.9] |
2.56 [42.3] |
n.a. |
| 2 x 80 mg OxyContin* |
1859.3 [30.1] |
153.4 [25.1] |
2.78 [69.3] |
n.a. |
| 1 x 160 mg OxyContin* |
1856.4 [30.5] |
156.4 [24.8] |
2.54 [36.4] |
n.a. |
† for single-dose AUC
= AUC0-inf; for multiple-dose AUC = AUC0-T
* data obtained while volunteers received naltrexone which can enhance
absorption
|
OxyContin® is NOT INDICATED FOR RECTAL ADMINISTRATION. Data from
a study involving 21 normal volunteers show that OxyContin Tablets administered
per rectum resulted in an AUC 39% greater and a Cmax 9% higher than tablets
administered by mouth. Therefore, there is an increased risk of adverse events
with rectal administration.
Food Effects
Food has no significant effect on the extent of absorption of oxycodone from OxyContin. However, the peak plasma concentration of oxycodone increased by 25% when a OxyContin 160 mg Tablet was administered with a high-fat meal.
Distribution
Following intravenous administration, the volume of distribution (Vss) for
oxycodone was 2.6 L/kg. Oxycodone binding to plasma protein at 37°C and
a pH of 7.4 was about 45%. Once absorbed, oxycodone is distributed to skeletal
muscle, liver, intestinal tract, lungs, spleen, and brain. Oxycodone has been
found in breast milk (see PRECAUTIONS).
Metabolism
Oxycodone hydrochloride is extensively metabolized to noroxycodone, oxymorphone, noroxymorphone, and their glucuronides. The major circulating metabolite is noroxycodone with an AUC ratio of 0.6 relative to that of oxycodone. Noroxycodone is reported to be a considerably weaker analgesic than oxycodone. Oxymorphone, although possessing analgesic activity, is present in the plasma only in low concentrations. The correlation between oxymorphone concentrations and opioid effects was much less than that seen with oxycodone plasma concentrations. The analgesic activity profile of other metabolites is not known.
The formation of oxymorphone and noroxycodone is mediated by cytochrome P450
2D6 and cytochrome P450 3A4, respectively. In addition, noroxymorphone formation
is mediated by both cytochrome P450 2D6 and cytochrome P450 3A4. Therefore,
the formation of these metabolites can, in theory, be affected by other drugs
(see Drug-Drug Interactions).
Excretion
Oxycodone and its metabolites are excreted primarily via the kidney. The amounts
measured in the urine have been reported as follows: free oxycodone up to 19%;
conjugated oxycodone up to 50%; free oxymorphone 0%; conjugated oxymorphone
≤ 14%; both free and conjugated noroxycodone have been found in the urine
but not quantified. The total plasma clearance was 0.8 L/min for adults.
Special Populations
Elderly
The plasma concentrations of oxycodone are only nominally affected by age, being 15% greater in elderly as compared to young subjects.
Gender
Female subjects have, on average, plasma oxycodone concentrations up to 25% higher than males on a body weight adjusted basis. The reason for this difference is unknown.
Renal Impairment
Data from a pharmacokinetic study involving 13 patients with mild to severe
renal dysfunction (creatinine clearance < 60 mL/min) show peak plasma oxycodone
and noroxycodone concentrations 50% and 20% higher, respectively, and AUC values
for oxycodone, noroxycodone, and oxymorphone 60%, 50%, and 40% higher than normal
subjects, respectively. This is accompanied by an increase in sedation but not
by differences in respiratory rate, pupillary constriction, or several other
measures of drug effect. There was an increase in t˝ of elimination for oxycodone
of only 1 hour (see PRECAUTIONS).
Hepatic Impairment
Data from a study involving 24 patients with mild to moderate hepatic dysfunction
show peak plasma oxycodone and noroxycodone concentrations 50% and 20% higher,
respectively, than normal subjects. AUC values are 95% and 65% higher, respectively.
Oxymorphone peak plasma concentrations and AUC values are lower by 30% and 40%.
These differences are accompanied by increases in some, but not other, drug
effects. The t˝ elimination for oxycodone increased by 2.3 hours (see PRECAUTIONS).
Drug-Drug Interactions
(see PRECAUTIONS)
Oxycodone is metabolized in part by cytochrome P450 2D6 and cytochrome P450 3A4 and in theory can be affected by other drugs.
Oxycodone is metabolized in part by cytochrome P450 2D6 to oxymorphone which represents less than 15% of the total administered dose. This route of elimination may be blocked by a variety of drugs (e.g., certain cardiovascular drugs including amiodarone and quinidine as well as polycyclic anti-depressants). However, in a study involving 10 subjects using quinidine, a known inhibitor of cytochrome P450 2D6, the pharmacodynamic effects of oxycodone were unchanged.
Pharmacodynamics
A single-dose, double-blind, placebo- and dose-controlled study was conducted using OxyContin® (10, 20, and 30 mg) in an analgesic pain model involving 182 patients with moderate to severe pain. Twenty and 30 mg of OxyContin were superior in reducing pain compared with placebo, and this difference was statistically significant. The onset of analgesic action with OxyContin occurred within 1 hour in most patients following oral administration.
Clinical Trials
A double-blind placebo-controlled, fixed-dose, parallel group, two-week study was conducted in 133 patients with chronic, moderate to severe pain, who were judged as having inadequate pain control with their current therapy. In this study, 20 mg OxyContin q12h but not 10 mg OxyContin q12h decreased pain compared with placebo, and this difference was statistically significant.
Last updated on RxList: 9/15/2009