| Revision as of 23:16, 17 June 2004 editJfdwolff (talk | contribs)Administrators81,547 editsm tyop← Previous edit | Revision as of 03:51, 7 July 2004 edit undoBSuehs (talk | contribs)28 edits added pharmacology, pk, and metabolism sections...cleaned up others.Next edit → | ||
| Line 1: | Line 1: | ||
| '''Olanzapine''' ('''Zyprexa'''® or in a combination with ] as '''Symbyax'''®) |
'''Olanzapine''' ('''Zyprexa'''® or in a combination with ] as '''Symbyax'''®) was the second ] to gain FDA approval and has become one of the most commonly used ]s. Olanzapine has been ] approved for the treatment of ], acute ] in ], agitation associated with schizophrenia and bipolar disorder, and as maintenance treatment in ]. Olanzapine is manufactured and marketed by the ] ]. | ||
| ==Pharmacology== | |||
| In December ] the FDA approved Symbyax to treat the ] phase of ]. | |||
| Olanzapine is structurally similar to clozapine, and is classified as a thienobenzodiazepine. Olanzapine has a high affinity for dopamine, serotonin, histamine, cholinergic muscarinic and alpha adrenergic receptors. The mechanism of action of olanzapine is unknown, however it is theorized that olanzapine's antipsychotic activity is mediated primarily by antagonism at dopamine receptors, specifically D2. Serotonin antagonism may also play a role in the effectiveness of olanzapine, but the significance of 5-HT2A antagonism is debated among researchers. Antagonism at muscarinic, histaminic and alpha adrenergic receptors likely explains some of the side effects of olanzapine, such as anticholinergic effects, sedation and orthostasis. | |||
| ==Pharmacokinetics== | |||
| Olanzapine displays linear kinetics. Its elimination half-life ranges from 21 to 54 hours. Steady state plasma concentrations are achieved in about a week. Olanzapine undergoes extensive first pass metabolism and bioavailability is not effected by food. | |||
| ==Metabolism== | |||
| Olanzapine is metabolize by the Cytochrome P450 system isoenzymes 1A2 and 2D6 (minor pathway). Drug metabolism may increased or decreased by agents that induce (e.g. cigarette smoke) or inhibit (e.g. fluvoxamine or ciprofloxacin) CYP1A2 activity respectively. | |||
| ==Adverse Events== | |||
| ⚫ | Adverse events reported in the package insert for olanzapine include dry mouth, ], ], ], ], ], and weight gain. Olanzapine is reported to cause ],] and ], although at a much reduced rate when compared to the classical antipsychotics. | ||
| Recently the FDA required the manufacturers of all atypical antipsychotics to include a warning about the risk of hyperglycemia and diabetes with atypical antipsychotics. Indeed, there are many case reports of olanzapine-induced hyperglycemia and diabetes. Additionally there are some case reports of olanzapine-induced diabetic ketoacidosis. There is data showing that olanzapine can decrease insulin sensitivity. In addition, increased triglyceride level may also be an issue with olanzapine. Impaired glucose metabolism, high triglycerides, and obesity have been shown to be constituents of the ] and may increase the risk of cardiovascular disease. The data suggests that olanzapine may be more likely to cause adverse metabolic effects than some of the other atypical antipsychotics. | |||
| ==Uses== | |||
| Since the ascendancy of atypical antipsychotics, olanzapine has become a frequently-used first line agent for ] and ]. | |||
| ==Side effects== | |||
| Common side effects include ] symptoms: ] rigidity, stiffness and twitches, restlessness and ]. ], ] and ] are longer-term concerns that may affect the development of ] later on in life. | |||
| ⚫ | Olanzapine is reported to cause ] and ], although at a much reduced rate when compared to the classical antipsychotics. | ||
| == External links == | == External links == | ||
| * - manufacturer's site | * - manufacturer's site | ||
| * - promotional site | * - promotional site | ||
| * | |||
| ] | ] | ||
Revision as of 03:51, 7 July 2004
Olanzapine (Zyprexa® or in a combination with fluoxetine as Symbyax®) was the second atypical antipsychotic to gain FDA approval and has become one of the most commonly used atypical antipsychotics. Olanzapine has been FDA approved for the treatment of schizophrenia, acute mania in bipolar disorder, agitation associated with schizophrenia and bipolar disorder, and as maintenance treatment in bipolar disorder. Olanzapine is manufactured and marketed by the pharmaceutical company Eli Lilly and Company.
Pharmacology
Olanzapine is structurally similar to clozapine, and is classified as a thienobenzodiazepine. Olanzapine has a high affinity for dopamine, serotonin, histamine, cholinergic muscarinic and alpha adrenergic receptors. The mechanism of action of olanzapine is unknown, however it is theorized that olanzapine's antipsychotic activity is mediated primarily by antagonism at dopamine receptors, specifically D2. Serotonin antagonism may also play a role in the effectiveness of olanzapine, but the significance of 5-HT2A antagonism is debated among researchers. Antagonism at muscarinic, histaminic and alpha adrenergic receptors likely explains some of the side effects of olanzapine, such as anticholinergic effects, sedation and orthostasis.
Pharmacokinetics
Olanzapine displays linear kinetics. Its elimination half-life ranges from 21 to 54 hours. Steady state plasma concentrations are achieved in about a week. Olanzapine undergoes extensive first pass metabolism and bioavailability is not effected by food.
Metabolism
Olanzapine is metabolize by the Cytochrome P450 system isoenzymes 1A2 and 2D6 (minor pathway). Drug metabolism may increased or decreased by agents that induce (e.g. cigarette smoke) or inhibit (e.g. fluvoxamine or ciprofloxacin) CYP1A2 activity respectively.
Adverse Events
Adverse events reported in the package insert for olanzapine include dry mouth, dizziness, sedation, insomnia, orthostasis, akathisia, and weight gain. Olanzapine is reported to cause extrapyramidal symptoms,tardive dyskinesia and neurological malignant syndrome, although at a much reduced rate when compared to the classical antipsychotics.
Recently the FDA required the manufacturers of all atypical antipsychotics to include a warning about the risk of hyperglycemia and diabetes with atypical antipsychotics. Indeed, there are many case reports of olanzapine-induced hyperglycemia and diabetes. Additionally there are some case reports of olanzapine-induced diabetic ketoacidosis. There is data showing that olanzapine can decrease insulin sensitivity. In addition, increased triglyceride level may also be an issue with olanzapine. Impaired glucose metabolism, high triglycerides, and obesity have been shown to be constituents of the metabolic syndrome and may increase the risk of cardiovascular disease. The data suggests that olanzapine may be more likely to cause adverse metabolic effects than some of the other atypical antipsychotics.
External links
- Zyprexa - manufacturer's site
- Olanzapine.com - promotional site
- Package Insert