Clinical Trials


Interaction Between Fosamprenavir/Ritonavir and a Single-dose Olanzapine (FORZA) (FORZA)

This study has been completed
Radboud University


Information provided by (Responsible Party)
Radboud University Identifier

First received: August 17, 2009
Last updated: January 7, 2011
Last Verified: January 2011
History of Changes


The effect of fosamprenavir/ritonavir (steady state) on the pharmacokinetics of a single dose of olanzapine will be studied.

In this study, the investigators expect an inducible effect of fosamprenavir/ritonavir on the CYP1A2 and UGT metabolism of olanzapine.

Condition Intervention Phase
HIV Infections

Drug : fosamprenavir/ritonavir
Drug : olanzapine
Phase 1

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: The Effect of FOsamprenavir/Ritonavir on the Pharmacokinetics of a Single-dose of the Antipsychotic Agent olanZApine (FORZA)

Further study details as provided by Radboud University:

Primary Outcome Measures

  • olanzapine concentrations [ Time Frame: pharmacokinetic curve after a single dose of olanzapine alone or added to steady state fosamprenavir/ritonavir ]
Secondary Outcome Measures:
  • adverse events [ Time Frame: entire study ]

Enrollment: 24
Study Start Date: November 2009
Study Completion Date: August 2010
Primary Completion Date: August 2010 (Final data collection date for primary outcome measure)

Arms Assigned Interventions
Experimental: fosamprenavir/ritonavir/olanzapine
single dose of 15 mg olanzapine after 13 days of fosamprenavir/ritonavir 700mg/100mg BID
Drug: fosamprenavir/ritonavir

16 days 700mg/100mg RTV BID

Drug: olanzapine

15 mg olanzapine single dose

Active Comparator: single dose olanzapine
Single dose of 10 mg olanzapine
Drug: olanzapine

10 mg olanzapine single dose

Detailed Description:

Psychosis and other mental illnesses are commonly described in patients infected with the human immunodeficiency virus (HIV). New-onset psychosis is estimated to occur in up to 15% of patients infected with HIV while 5 to 7% of patients with HIV-infection suffer from pre-existing mental illnesses including schizophrenia. Olanzapine could be an attractive antipsychotic in HIV/AIDS patients with schizophrenia.
Because olanzapine is a substrate for both UGT and CYP1A2, the pharmacokinetics of olanzapine might be influenced by low-dose ritonavir in combination with fosamprenavir. The current study is designed to test this hypothesis. Furthermore, in this study we evaluate the safety of such combination.



Ages Eligible for Study: 18 Years to 55 Years  
Sexes Eligible for Study: All  
Accepts Healthy Volunteers: Yes  


Inclusion Criteria:

  • Subject is at least 18 and not older than 55 years at screening.
  • Subject has a Quetelet Index (Body Mass Index) of 18 to 30 kg/m2, extremes included.
  • Subject is able and willing to sign the Informed Consent Form prior to screening evaluations.
  • Subject is in good age-appropriate health condition as established by medical history, physical examination, electro-cardiography, results of biochemistry, haematology and urinalysis testing within 4 weeks prior to the first dose. Results of biochemistry, haematology and urinalysis testing should be within the laboratory's reference ranges. If laboratory results are not within the reference ranges, the subject is included on condition that the Investigator judges that the deviations are not clinically relevant. This should be clearly recorded.
  • Subject has a normal blood pressure and pulse rate, according to the Investigator's judgement.

Exclusion Criteria:
  • Documented history of sensitivity/idiosyncrasy to medicinal products or excipients.
  • Positive HIV test.
  • Positive hepatitis B or C test.
  • Pregnant female (as confirmed by an HCG test performed less than 4 weeks before the first dose) or breast-feeding female. Female subjects of childbearing potential without adequate contraception, e.g. hysterectomy, bilateral tubal ligation, (non-hormonal) intrauterine device, total abstinence, double barrier methods, or two years post-menopausal. They must agree to take precautions in order to prevent a pregnancy throughout the entire conduct of the trial.
  • Therapy with any drug (for two weeks preceding dosing), except for paracetamol.
  • Relevant history or presence of pulmonary disorders (especially COPD), cardiovascular disorders, neurological disorders (especially seizures and migraine), psychiatric disorders, glaucoma, gastro-intestinal disorders, renal and hepatic disorders, hormonal disorders (especially diabetes mellitus), coagulation disorders.
  • Relevant history or current condition that might interfere with drug absorption, distribution, metabolism or excretion.
  • History of or current abuse of drugs, alcohol or solvents.
  • Inability to understand the nature and extent of the trial and the procedures required.
  • Participation in a drug trial within 60 days prior to the first dose.
  • Donation of blood within 60 days prior to the first dose.
  • Febrile illness within 3 days before the first dose.
  • History of narrow-angle glaucoma.

contacts and locations

Contacts and Locations

Choosing to participate in a study is an important personal decision.Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below.For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00977301


CRCN, Radboud Universtity Nijmegen Medical Centre
Nijmegen, Netherlands

Sponsors and Collaborators

Radboud University


Principal Investigator: David Burger, PharmD, PhD Radboud University
More Information

More Information

Responsible Party: D.M. Burger, PharmD, PhD, Radboud University Nijmegen Medical Centre Identifier: NCT00977301   History of Changes  
Other Study ID Numbers: UMCN-AKF 08.04  
Study First Received: August 17, 2009  
Last Updated: January 7, 2011  

Keywords provided by Radboud University:

HIV infection

Additional relevant MeSH terms:
HIV Infections
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