Crystal Meth and HIV/AIDS: The Perfect Storm?
Methamphetamine use is already influencing the HIV/AIDS epidemic in the U.S. and
could have an even greater impact in coming years.
Crystal methamphetamine (CM) is an extremely addictive stimulant that increases
sexual arousal while reducing inhibition and judgment. Its use is associated
with a range of high-risk sexual behaviors that increase the likelihood of
acquiring or transmitting HIV. Given the relatively high prevalence of CM use
among people living with HIV and among men who have sex with men (MSM), there is
great concern that this drug is fueling the HIV epidemic. Equally worrisome are
the effects that CM use can have on the prognosis and overall health of
HIV-infected patients.
Background
Known by various street names (most commonly, "ice" and "glass"), CM can be
smoked, snorted, injected, swallowed, or inserted into the rectum. Compared with
other illegal drugs, CM is inexpensive, readily available, and provides a
stronger, longer-lasting "high" (8-24 hours).1 Prevalence of use in the U.S. is
difficult to pinpoint, but estimates of past-year use from national
cross-sectional surveys range from 1.5% to 2.8% among young adults.2 Estimates
of past-year use are even higher among MSM - 9.7%, according to one San
Francisco study (ACC Sep 28 2005)3 - in part because the drug is now deeply
embedded in the MSM "circuit party"culture.4
Commonly cited reasons for using CM, aside from peer pressure, are increased
sexual sensitization, mood enhancement, and disinhibition. However, the drug is
also used to provide an escape from stress, depression, alienation, and
loneliness, all of which are common among people living with HIV. Furthermore,
many HIV-infected MSM report using CM as a way to deal with their illness or
with homophobia or prejudice.4,5 Consequently, CM use is highly prevalent among
people living with HIV. In a San Francisco study, 19% to 39% of HIV-infected
people reported using CM during the previous year.6 This high prevalence is
alarming because CM use can increase the risk for HIV transmission and also
contribute to poorer health outcomes in HIV-infected users.
Methamphetamine Use and HIV Transmission
CM use increases the risk for HIV transmission and acquisition in a number of
ways.
First, the drug lowers sexual inhibitions, impairs judgment, and provides the
necessary energy and confidence to engage in sexual activity for long periods of
time. As a result, methamphetamine users are more likely than nonusers to engage
in unprotected anal sex and to have sex with injection drug users, HIV-positive
partners, and those of unknown HIV status; they also tend to report a greater
number of sex partners and to have a history of other sexually transmitted
diseases (STDs).3,7,8
Second, CM use is a well-documented cause of erectile dysfunction, which can
lead users to engage in even higher-risk sexual activities. For example, users
who cannot sustain an erection may switch to receptive anal sex ("bottoming"),
which carries a higher risk of HIV acquisition than does insertive anal sex.
Alternatively, users may take erectile-dysfunction drugs, and the combination of
these with CM can lead to longer, more-aggressive periods of sex, potentially
resulting in condom breaks or mucosal tears, which can cause bleeding and
increased risk of HIV transmission.
Third, CM causes mucosal dryness, which increases the risk for tissue tears.
Additional damage to rectal tissues can occur when CM is inserted into the
rectum ("keistering," "booty bumping").
Finally, when CM is injected, needle sharing can greatly enhance transmission of
HIV and hepatitis viruses.
Numerous cross-sectional studies have demonstrated an association between CM use
and increased risk for HIV infection, but only a few studies have prospectively
assessed seroincidence. In the largest of these, the Multicenter AIDS Cohort
Study, the relative risk for HIV seroconversion was 1.5 among CM users compared
with nonusers and was even higher (3.1) among men who used both methamphetamine
and poppers (ACC Apr 13 2007).9
Methamphetamine Use and Progression of HIV Disease
In addition to facilitating HIV transmission, CM use is associated with
detrimental behavior changes that can affect the prognosis and overall health of
people living with HIV. For instance, current methamphetamine use decreases
adherence to HIV treatment and medical follow-up.10 Frequent CM use has also
been associated with increased risk for antiretroviral resistance, particularly
to NNRTIs, with the obvious implications for treatment and transmission risk.11
For example, CM use is thought to have contributed to the acquisition of
triple-class-resistant virus by the New York City patient described in 2005 (ACC
Sep 1 2006).12 In addition, some patients use CM to treat HIV-associated
symptoms, such as fatigue, instead of seeing a physician. Such self-medication
may lead to underdiagnosis and undertreatment of HIV and to important
complications such as anemia and hypogonadism.5,10
CM use may also influence progression and complications of HIV disease more
directly. For example, animal studies have shown that CM can impair the immune
system13 and increase HIV replication,14 and human studies suggests that it can
accelerate the progress of HIV-related dementia.15
Other Consequences of Methamphetamine Use
Other consequences of CM use that are particularly harmful to HIV-infected
patients include deterioration of the teeth and gums (a result of dry mouth and
grinding of the teeth), reduced appetite, poor eating habits, and weight loss.
Furthermore, many users "crash" after using CM for several days straight and are
left with little energy and the very feelings they were trying to avoid -
depression and isolation.
Other adverse effects of CM use include intense cravings for CM when not taking
it; tachyphylaxis; increased risk for heart attack and stroke (because of
increases in blood pressure, heart rate, and body temperature); impaired memory,
reasoning, and ability to process information; and psychological problems, such
as depression, psychosis, aggressive behavior, hallucinations, and paranoia.
Chronic use can also cause skin lesions and damage the cardiovascular system,
lungs, liver, muscles, and nerve cells in the brain.
Although methamphetamine is not known to affect HIV medications, some PIs
increase absorption and decrease metabolism of CM, leading to severe reactions
or overdosing.16,17
Preventing and Treating Methamphetamine Addiction
Prevention of methamphetamine use is hampered by a relative paucity of
epidemiologic data that would enable us to assess the magnitude of the current
problem adequately and to evaluate the efficacy of various interventions.
Despite federal efforts to restrict pseudoepinephrine imports and a nationwide
decline in small methamphetamine laboratories, the drug continues to be widely
available. A report from the National Drug Intelligence Center suggests that
Mexican drug traders have relocated their labs from the U.S. to Mexico and have
expanded distribution to the midwestern and eastern U.S., underscoring the
difficulties of drug enforcement in the era of global trade.18 Developing
methamphetamine prevention "task forces" (involving community members and
representatives from at-risk groups, STD treatment centers, health departments,
and law enforcement) is a reasonable approach, despite a lack of efficacy
data.19 Educational campaigns should be tailored to specific target populations,
and care should be taken to help ensure that such campaigns do not increase
cravings in CM-addicted patients.20
Given the high prevalence and dire consequences of CM use among HIV-infected
patients, clinicians should be sure to ask patients about past or current use.
Drug testing is recommended for all patients who have a history of, or are
suspected of, using CM.
Few data are available to recommend any one method of methamphetamine treatment
over another.21 Cognitive behavior-based interventions (Matrix Model), 12-step
programs, drug testing, and contingency management interventions have been used
by different treatment centers, with varying degrees of success. Nevertheless,
treatment of CM addiction can be successful in decreasing risky sexual behaviors
and should be an integral part of any HIV prevention effort.21,22
Conclusion
All current data underscore the potential of methamphetamine to substantially
worsen the current HIV epidemic, with some studies indicating that this
potential is already being realized. Methamphetamine use is an important public
health problem and is associated with risky sexual behavior; increased rates of
transmission of HIV, other STDs, and hepatitis; serious adverse events; and poor
adherence to antiretroviral treatment. Prevention efforts not only must
encompass traditional education and awareness campaigns but also will require
local, national, and international policy changes, including allocation of
appropriate resources and funding. Comparative trials of different treatment
approaches are needed, as are better evidence-based protocols for treatment.
- Philip A. Yeon, MD, MPH&TM, and Helmut Albrecht, MD
Dr. Yeon is Assistant Professor of Medicine in the Division of Infectious
Diseases at University of South Carolina School of Medicine. Dr. Albrecht is
Professor of Medicine and Chief of the Division of Infectious Diseases at
University of South Carolina School of Medicine.
Published in AIDS Clinical Care December 3, 2007
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