Yes, several illegal drugs can raise your white blood cell (WBC) count, though the effect varies significantly by substance. Some drugs trigger a direct inflammatory response that pushes white cells into your bloodstream, while others raise WBC counts indirectly by causing infections or tissue damage. A normal WBC count falls between about 4,500 and 11,000 cells per microliter. Counts above 11,000 are considered elevated.
Methamphetamine Has the Strongest Link
Among commonly used illegal drugs, methamphetamine shows the clearest connection to elevated white blood cell counts. A 2024 study comparing blood panels in people with methamphetamine use disorder found significantly higher white blood cell counts, neutrophil counts, lymphocyte counts, and monocyte counts compared to non-users. Neutrophils are the front-line immune cells your body sends to fight infection and respond to tissue stress, so their elevation suggests the body is reacting to ongoing damage or inflammation.
Amphetamines in general appear to drive this effect. In a large study published in The Scientific World Journal, patients who tested positive for amphetamines had notably higher WBC counts compared to controls, with a meaningful percentage reaching above-normal levels. The mechanism likely involves the intense stress response these stimulants trigger: flooding the body with stress hormones causes the bone marrow to release stored white blood cells and speeds up production of new ones.
Cocaine’s Surprising Effect on Immunity
Cocaine’s relationship with white blood cells is more complicated than you might expect. Rather than raising WBC counts, cocaine appears to suppress parts of the immune system. In a study of 72 patients who tested positive only for cocaine, the average WBC count was actually lower than in drug-free controls, at about 7,100 cells per microliter with a median of 6,800. Only one of those 72 patients had an above-normal count.
The reason seems to be that cocaine dials down several inflammatory signals. It reduces levels of key proteins that activate immune cells and ramps up production of an anti-inflammatory protein called IL-10. It also slows the growth of certain immune cells called lymphocytes. So cocaine on its own tends to quiet the immune system rather than rev it up.
That said, cocaine carries a separate, more dangerous blood cell risk. As of 2009, the DEA reported that 69% of cocaine seized at U.S. borders was cut with levamisole, a veterinary deworming agent. Levamisole can cause agranulocytosis, a condition where white blood cell counts drop to near zero. The CDC documented 21 cases across four states where cocaine users developed this condition, with some patients having absolute neutrophil counts of literally zero. Agranulocytosis leaves a person extremely vulnerable to life-threatening infections and is fatal in roughly 7 to 10 percent of cases.
MDMA Shifts Immune Cells in Complex Ways
MDMA (ecstasy) doesn’t simply raise or lower your total white blood cell count. Instead, it reshuffles which types of immune cells are circulating. In controlled studies where recreational users were given 75 to 100 mg of MDMA, researchers observed a drop in CD4+ T-cells (the “helper” cells that coordinate your immune response) alongside a short-term spike in natural killer cells, which are the immune system’s rapid-response units against viruses and abnormal cells.
This pattern reverses with long-term use. Chronic MDMA users showed sustained reductions in both helper T-cells and natural killer cells compared to non-users. So while a single dose temporarily boosts one part of the immune system, repeated use suppresses it. A standard blood test might not flag this as an abnormal total WBC count, but the underlying immune function is compromised in ways that could matter if you’re fighting off an illness.
Infections From Drug Use Often Cause the Biggest Spikes
The most common reason drug use leads to a high white blood cell count isn’t the drug itself. It’s the infections that come with it. Injecting any drug with non-sterile equipment introduces bacteria directly into the bloodstream. This can cause skin abscesses, bloodstream infections, and infective endocarditis, a serious infection of the heart valves. These infections trigger a massive immune response, pushing WBC counts well above normal ranges.
Endocarditis is particularly dangerous in people who inject drugs because it can develop without the classic warning signs. In some cases, patients present with shortness of breath and heart failure symptoms rather than obvious fever, which can delay diagnosis. The elevated WBC count from such an infection far exceeds anything the drugs themselves would cause, potentially reaching 20,000 to 30,000 cells per microliter or higher.
Smoking drugs like methamphetamine or crack cocaine also damages lung tissue, which can lead to chronic inflammation and recurrent respiratory infections. Both keep white blood cell counts persistently elevated even between acute illness episodes.
How Long Counts Stay Elevated
If the elevated count is caused by an active infection, white blood cells typically return to normal once the infection is treated, which can take days to weeks depending on severity. For the inflammation driven by stimulant use itself, the timeline depends on how long and how heavily someone has been using.
Research on immune recovery after stopping drugs that affect white blood cell composition suggests that most cell types normalize within about four weeks of stopping the substance. However, certain functional measures of immune health, like how effectively natural killer cells do their job, can remain suppressed for a month or longer even after the cell counts look normal on paper. This means your blood work might return to a normal range relatively quickly, but your immune system’s actual ability to fight off threats may take longer to fully recover.
What an Elevated Count Could Mean
If you use drugs and your blood work shows a high white blood cell count, the elevation could reflect the direct inflammatory effects of stimulants like methamphetamine, an undiagnosed infection from drug use, tissue damage to the lungs, heart, or nasal passages, or a combination of all three. A mildly elevated count (11,000 to 15,000) could stem from stimulant-driven stress responses alone. Counts above 20,000 more strongly suggest an active infection that needs attention.
It’s worth knowing that a single blood draw captures only a snapshot. White blood cell counts fluctuate throughout the day and spike in response to physical stress, dehydration, and anxiety, all of which are common during or after drug use. A persistently elevated count across multiple tests is more meaningful than a single high reading.