Street/Party Drugs and HAART - CATIE · HIV by 200X as observed in mice, probably because cocaine...
Transcript of Street/Party Drugs and HAART - CATIE · HIV by 200X as observed in mice, probably because cocaine...
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Street/Party Drugs and HAART :How does it work and what must we do
APRIL 2007
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WORKSHOP ON THE INTERACTIONS BETWEEN
STREET/PARTY DRUGS AND ANTIRETROVIRAL THERAPY
(and other medications…)
Jean Clermont-Drolet, RNStreet Nurse, MIELS-Québec
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PRESENTATION
• Few Points• Depressants• Stimulants• Hallucinogens
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PolyconsumptionVery often, a person uses more than one product. Frequently combined drugs include :
• Alcohol, Tobacco and Cannabis • Depressants and Alcohol• Cocaine, Sedatives and Heroin• Amphetamines, GHB and Ketamine
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Toxicity
• Quantity• Health situation• Drug-use ways• Purity : ? and %
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Immune System
• Capacity decreased or supressed by mostof the drugs, making the body vulnerableto all kinds of infections and diseases.
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Enzyme CYP3A4
• Cytochrome P450 3A4 (abbreviated CYP3A4) (EC 1.14.14.1), a member of the cytochrome P450 mixed-function oxidase system, is one of the most important enzymes involved in the metabolism of xenobiotics in the body.
• CYP3A4 is involved in the oxidation of the largest range of substrates of all the CYPs.
• CYP3A4 is also, correspondingly, present in the largest quantity of all the CYPs in the liver.
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• Selected inducers, inhibitors and substrates of CYP3A41Type Agent
INDUCERS : barbiturates (phenobarbital etc), carbamazepine, dexamethasone, hyperforin (constituent of St Johns Wort), non-nucleoside reverse transciptase inhibitors (efavirenz, nevirapine, etc), griseofulvin, phenytoin, rifampicinINHIBITORS : amiodarone, azole antifungals (ketoconazole etc), bergamottin(constituent of grapefruit juice), cimetidine, ciprofloxacin, ciclosporin, diltiazem, imatinib, macrolide antibiotics (erythromycin etc), metronidazole, non-nucleoside reverse transciptas inhibitors (efavirenz, nevirapine etc), protease inhibitors(saquinavir etc), selective serotonin reuptake inhibitors (fluoxetine etc), verapamilSUBSTRATES : amiodarone, azole antifungals (ketoconazole etc), barbiturates(phenobarbital etc), benzodiazepines (diazepam etc), buspirone, calcium channelblockers (diltiazem, nifedipine etc), carbamazepine, codeine, ciclosporin, dextromethorphan, digoxin, ergot alkaloids, ethinylestradiol, fentanyl, haloperidol, HMG-CoA reductase inhibitors (atorvastatin etc), ivabradine, levonorgestrel, lidocaine, macrolide antibiotics (erythromycin etc), mifepristone, estradiol, ondansetron, omeprazole, paracetamol, PDE5 inhibitors (sildenafil etc), quinidine, quinine, selective serotonin reuptake inhibitors (fluoxetine etc), taxanes (paclitaxeletc), testosterone, theophylline, tricyclic antidepressants (amitriptyline etc), valproate, venlafaxine, warfarin, various anticancer agentsNotes: Where classes of agents are listed, there may be exceptions within the class. Non-nucleoside reverse transcriptase inhibitors have been shown to both induce and
Inhibit CYP3A4
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Depressants
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DepressantsAll of these drugs relax the Central Nervous
System- Alcohol- Tranquilizers (Barbiturates,
Benzodiazepines...)- Narcotics (Opium, Heroin, Codeine,
Morphine, Meperidine, Methadone, etc.)- GHB, Rohypnol
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Alcohol + IPs and/or NNRTIs• Heavy ingestion of alcohol leads to enzyme
(CYP2E1 and CYP3A4) inhibition = overtherapeutic level of PIs and NNRTIs.
But• Chronic ingestion also leads to enzyme
induction, which may result in sub-therapeuticlevels of PIs and NNRTIs.
Source : www.numedx.com
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Alcool + ABC (NRTI)• Alcohol increases Abacavir (Ziagen) levels
in blood (up to 41% in one study) because ABC is metabolized by alcoholdehydrogenase.(JA McDoweel, Pharmacokinetic interaction of abacavirand ethanol in immunodeficiency virus-infected adults, Antimicrob Agents Chemather 2000; 44, 1686-1690)
Source : www.numedx.com
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Alcool + ddI (Videx) (NRTI)• Increased risk of pancreatitis
Source : Recreational Drugs and HIV Antiretroviral : a Guide to interactions for clinicians, by NY/NJ AIDS Eduction and Training Center, Summer 2005
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Heroin
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Heroin + RTV (PI)• Ritonavir (Norvir) decreases Heroin levels by 50%,
quickly transformed in morphin in blood• Watch for opiate withdrawal, but caution is in order : RTV
and the other PIs have sometimes been known to have opposite effects (they cut methadone levels in real life, while test tube experiments predicted they would increase them).
Source : Anti-HIV Meds + Street Drugs: Some Cocktails Don’t MixNotes from the Underground, PWA Health Newsletter Winter 1998-99.From : http://www.thebody.com/pwa/NFUwin98-
99/street_drugs.html
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Methadone
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Methadone + HIV Infection
• With its mechanisms of metabolization, Methadone can favor infection by HIV by activating the virus and decreasing the production of CD4.
Source : www.harmreduction.org
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Methadone + ARV
• Many studies performed.• FDA made various recommendations
depending on which ARV is usedsimultaneously with methadone.
www.harmreduction.org
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Methadone + RTV (PI)• Ritonavir (Norvir) decreases methadone levels by 40% in
blood : Increase in dose of methadone may beconsidered, according to FDA label.
Source : www.norvir.comBUT
• Effect unpredictable : either increase or decreasemethadone levels.
• Source : Risky Cocktails : Interactions Between Street Drugs and HIV Medications, by Guy Pujol.
Source : www.thebody.com/asp/apr03/risky_cocktails.html
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Methadone + LPV-RTV (PI)
• Lopinavir-Ritonavir (Kaletra) decreasesmethadone levels by 53% in blood.
• Dose of methadone may need to beincreased, according to FDA label.
Source : www.kaletra.com
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Methadone + AZT (NRTI)
• Methadone increases by 50% Zidovudine (Retrovir) levels in blood.
• Dose reduction of AZT not recommendedroutinely
Source : www.retrovir.com
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Methadone + DDI (NRTI)
• Methadone decreases Didanosine (Videx) levels by 52% in blood.
• No recommendations on doses on FDA label.
Source : www.videxec.com
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Methadone + EFV (NNRTI)
• Effavirez (Sustiva) decreases methadonelevels by 60% in blood.
• Patients taking methadone and EFV mayexhibit signs of narcotic withdrawal.
• Methadone dose should be adjustedupward by 5mg to 50 mg, accordingly as written on FDA label.
Source : www.sustiva.com
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Methadone + NVP (NNRTI)
• Nevirapine (Viramune) decreasesmethadone levels by 60% in blood.
• Patients taking methadone and NVP mayexhibit signs of narcotic withdrawal.
• Methadone dose should be adjustedaccordingly (upward) as noted on FDA label.
Source : www.viramune.com
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Methadone + Diflucan
• Diflucan (fluconazole) can raise methadone levels in the blood by up to 35%.
• No symptoms of overdose were reported in a 13 people study.
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Methadone + Cipro
• Cipro (ciproflozacin), an oral antibiotic used to treat MAC, bacterial pneumonia and many common infections, can cause significant increases in methadone levels.
• This increase could possibly lead to serious sedation and even overdose for some people.
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Barbiturates
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Barbiturates
Seconal® (Secobarbital)Nembutal® (Pentobarbital)Amytal® (Amobarbital)Tuinal® (Amobarbital-secobarbital)Mandrax® (Methaqualone)
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Barbiturates + ARV• PIs increase blood levels of
barbiturates;• Barbiturates can lower levels of PIs
and NNRTIs. This interaction can reduce or eliminate the benefit of the anti-HIV drug, and possibly cause HIV to develop resistance to the drug.
Source : www.numedx.com
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Benzodiazepines
•
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BenzodiazepinesGeneric Name ( ® ) Average Half-Life
• Alprazolam (Xanax) 12-19h• Bromazepam (Lectopam) 10-20h• Chlordiazepoxide (Librium) 6-30h• Clonazepam (Rivotril) 16-20h• Diazepam (Valium) 20-80h• Flunitrazepam (Rohypnol) 15-20h• Lorazepam (Ativan) 10-20h• Nitrazepam (Mogadon) 30-60h• Oxazepam (Serax) 5-10h• Temazepam (Restoril) 3-25h• Triazolam (Halcion) 2-5h
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Sedatives + PIs• PIs inhibit metabolism of sedatives, and increase plasma
concentration of Benzodiazepines and/or Barbiturates.• Use of PIs with Benzo should be avoided due to
increased risk of sedation and respiratory depression.• Triazolam (Halcion) and Midazolam (Versed)
specifically containdicated with all PIs. It can lead to a very dangerous, even deadly intreaction, raising Halcion or Versed levels so much that serious sedation coud result, possibly stopping breathing.
• Source : www.numedx.com
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Benzodiazepines + RTV (PI)• Huge increase in blood levels of
Diazepam (Valium) by Ritonavir (Norvir).• Temazepam (Restoril) metabolizes more
quickly with Ritonavir (Norvir).• Ritonavir (Norvir) decreases therapeutic
effect of Lorazepam (Ativan), Oxazepam(Serax) and Temazepam (Restoril).
Source : www.numedx.com
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Benzodiazepines + Delavirdine(NNRTI’s)
• Delavirdine (Rescriptor) likely inhibitsbenzodiazepines metabolism through CYP3A4 inhibition and increases risk of adverse effects : concomittant use should be avoided.
Source : Recreational Drugs and HIV Antiretroviral: a Guide to interactions for clinicians,by NY/NJ AIDS Eduction and Training Center,
Summer 2005
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Rohypnol
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Flunitrazepam + RTV (PI)
• Ritonavir (Norvir) increases by 2X to 3X the blood levels of Flunitrazepam(Rohypnol).
Source : www.numedx.com
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GHB
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GHB + PIs
• PIs increase by 5X to 10X the bloodlevels of GHB : Serious risks of myoclonicor seizure activity, bradycardia, respiratorydepression or loss of consciousness.
(Harrington RD, Life-Threatening interactions between HIV-1 protease inhibitors and the illicit drugs MDMA and GHB, Arch. Intern. Med., 1999; 159; 2221-2224)
Source : www.numedx.com
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Stimulants
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Stimulants
TobaccoCoffee, Tea
• Cocaine• Crack• Amphetamines• Ecstasy
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Cocaine
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Crack
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Cocaine + HIV• Cocaine could stimulate the viral replication of
HIV by 200X as observed in mice, probablybecause cocaine would increase the number of CCR5 and CXCR4 receptors on CD4 cells(receptors that HIV uses to infect the cells).
• Increases rate of HIV viral replication in vitro.• No known interactions between Cocaine and
ARVs.
(Roth MD, J. Infect. Diseases, 2002; 185(5), 701-705)
Source : www.numedx.com
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Amphetamines
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Amphetamines
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Amphetamines + PIs• PIs increase by 2X to 3X amphetamine
build-up in blood, by inhibiting CYP2D6 metabolism
• Serious risks of overdose especially withRitonavir (Norvir) : hypertension, hyperthermia, seizures, arrhythmia, tachycardia and tachypnea.
Source : www.numedx.com
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Crystal (Ice)
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Crystal (Ice) + RTV (PI)
• Ritonavir (Norvir) increases by 2X to 3X the levels of crystal methamphetamine(ice) in blood.
Source : www.numedx.com
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Ecstasy
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Ecstasy + HIV• One dose of MDMA (100 mg) decreased CD4+ cells by
30% within hours after a single dose.• Two doses of MDMA, four hours apart, decreased CD4+
cells by 40%.• Additional finding: decreased ability of CD4+ cells to fight
infection.
Source : Pacifici R., Zuccaro P., et. al. Effects of Repeated Doses of MDMA ("Ecstacy") on Cell-Mediated Immune Response in Humans. Life Sciences 2001; 69:2931-2941; in www.thebodypro.com
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Ecstasy + PIs• PIs increase levels of ecstasy;• Ritonavir (Norvir) increases by 5X to 10X the
levels of MDMA in blood : Risk of overdose and death.
• Potential to increase ecstasy levels with Kaletra.• Indinavir (Crixivan) : increases risk of kedney
stones due to dehydration.
(Henry JA, Fatal interactions between RTV and MDMA, Lancet, 1998; 352; 1751-1752)
Source : www.numedx.com
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Hallucinogens
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Hallucinogens
• Marijuana, Cannabis, Hash• Mescaline, LSD• PCP, Ketamine• Glue, Solvants and Volatile Products
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Marijuana
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Hashish
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Marijuana + PIs
• PIs increase levels of THC in blood by decreasing elimination metabolism of cannabis.
• Smaller amounts of THC may be advisedfor medicinal purposes.
• Marinol can be introduced at a lower dose and increased for effect.
Source : www.numedx.com
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Marijuana + PIs and/or NNRTIs
• Smoked Marijuana may lower PIs and NNRTIs in blood.
• In one study, smoked THC decreasedNelfinavir (Viracept) by 17% and Indinavir(Crixivan) by 21% in blood.
(Kosel BW, The effects of cannabinoids on the pharmacokinetics of IDV and NFV, AIDS 2002; 16, 543-550)
Source : www.numedx.com
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Glue, Solvants,Volatil Products
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InhalantsThe chronic use of inhalants has been associated with a
number of serious health problems :• Glue and paint thinner sniffing produce kidney
abnormalities while the solvents toluene and trichloroethylene cause liver damage.
• Memory impairment, attention deficits, and diminishednon-verbal intelligence have been related to the abuse of inhalants.
• Deaths resulting from heart failure, asphyxiation, or aspiration have occurred.
• No known interactions between glue, solvants, volatil products and ARVs.
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LSD
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LSD + PIs and/or NNRTI
• PIs and/or NNRTIs CYP450 inhibitors maycause build-up of LSD
• Overdose symptoms includehallucinations, agitation, psychosis and ‘’flashbacks’’.
Source : www.numedx.com
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PCP
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PCP + PIs and/or NNRTIs
• PIs and/or NNRTIs may increase levels of Phencyclidine in blood
• Overdose symptoms include : seizures, hypertension, hyperthermia and rhabdamyalysis.(Laurenzana EM, Metabolism of PCP by human livermicrosomes, Drug Metab. Dispos. 1997; 25 : 557-563)
Source : www.numedx.com
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Ketamine
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Ketamine + ARV
• ARV builds up Ketamine in blood, especially :
• Ritonavir (Norvir) (PI) • Nelfinavir (Viracept) (PI)• Effavirenz (Sustiva) (NNRTI)
Source : www.numedx.com
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Ketamine + RTV (PI)
• Ritonavir (Norvir) likely builds up Ketaminein blood
• Overdose symptoms : respiratorydepression, loss of consciousness and hallucinations.
Source : www.numedx.com
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OTHER MEDICATIONS
• Because some of our patients take more than street and/or club drugs…
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REBETRON + NRTI
• Administration of nucleoside analogues has resulted in fatal and non-fatal lactose acidosis.
• Co-administration should be undertakenwith caution, and only if the potentialbenefits outweigh the potential risks.
Source : www.rebetron.com
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PEGETRON + AZT (NRTI)
• Both Peg-Interferon and Ribavirin cantemporarily weaken the bone marrow.
• Use of Zidovudine (Retrovir, Combivir) may make this worse.
• Same for Pegasys
Sources : www.catie.cawww.pegetron.com
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RIBAVIRIN + NRTI• Ribavirin has been shown in vitro to inhibit
phosphorylation of AZT (Zidovudine = Retrovir) and D4T (Stavudine = Zerit), which could lead to a decrease in ARV activity.
• The concomitant use of Ribavirin and AZT of D4T should be avoided
Source : www.pegasys.com
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RIBAVIRIN + ddI• NOT RECOMMENDED• Ribavirin increases ddI (Didanosine =
Videx) activity in blood.• Reports of fatal hepatic failure, as well as
peripheral neuropathy, pancreatitis and symptomatic hyperlactatemia/ lactisacidosis has been reported in clinicaltrials.
Source : www.pegasys.com
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Viagra + PI
• PIs, Ritonavir (Norvir) in particular, increase by 4X the levels of SildenafilCitrate (Viagra) in blood.
• If indicated, start with Viagra 25 mg instead of usual 50 mg dose in conjunctionwith PIs.
Source : www.viagra.com
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Viagra + Poppers
• Be sure not to use poppers if you take Viagra, Levitra or Cialis.
• Poppers (amyl nitrate or butyl nitrate) increase levels of there drugs, lowering your blood pressure enough to cause serious, even lethal, reactions.
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Anabolic Steroids + RTV (PI)
• Ritonavir (Norvir) increases by 2X to 3X the levels of anabolic steroid in blood.
Source : www.numedx.com
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For more information
• www.numedx.com, in Quality of Life : Lifestyles, Risky Cocktails
• www.thebodypro.com• www.harmreduction.org• www.catie.ca• All medication Websites
(ex. : www.norvir.com)