Pepper spray is intensely painful but usually temporary. For most healthy adults, symptoms resolve within 10 to 30 minutes and don’t require medical treatment. That said, it’s far from harmless. Exposure can cause real injury, particularly to the eyes and lungs, and certain people face life-threatening risks.
What It Feels Like
Pepper spray’s active ingredient is oleoresin capsicum, an oily extract from cayenne peppers. Civilian sprays range from 500,000 to 2 million Scoville Heat Units, while law enforcement versions reach 2 million to 5.3 million SHU. For comparison, a raw jalapeño tops out around 8,000 SHU.
When the spray hits your face, it triggers an immediate, overwhelming burning sensation across every surface it touches: skin, eyes, nose, mouth, and throat. Your eyes clamp shut involuntarily. Tears pour out. Mucus floods your nasal passages. You’ll likely cough, gag, and feel short of breath as the irritant inflames your upper airway. The pain is severe enough to raise blood pressure by 10 to 15 percent from the discomfort alone. Most people describe it as the worst burning they’ve ever experienced, and it’s completely incapacitating for the first several minutes.
How Long the Effects Last
The worst of it passes relatively quickly. In most cases, the intense pain, temporary blindness, and breathing difficulty resolve within 30 minutes. Eye irritation and skin redness can linger for an hour or two after that. A cough or mild shortness of breath sometimes persists longer, especially in people with underlying lung conditions.
The oily nature of capsicum is part of what makes recovery uncomfortable. Unlike water-soluble irritants, the oil clings to skin and gets trapped in eyelashes and hair, which can re-expose you if not properly washed off.
Eye Damage and Complications
For most people, the eye effects are temporary. But pepper spray is not risk-free for your vision. The American Academy of Ophthalmology has documented cases of persistent corneal defects, corneal ulcers, and scarring following exposure. In one reported case where the person’s eyes weren’t flushed promptly, the spray caused an epithelial defect that led to a permanent corneal scar and reduced visual acuity.
Close-range exposure carries the highest risk. At short distances, the concentrated blast can cause corneal swelling, inflammation inside the eye, and blood vessel growth into the cornea. When pepper spray is deployed as a projectile (in canisters or grenades), the physical impact itself can rupture the eye, fracture the eye socket, or detach the retina. These are serious injuries that may require surgery and can cause permanent vision loss.
Respiratory Risks
The lungs are where pepper spray becomes genuinely dangerous. Inhaling it triggers coughing, throat pain, and shortness of breath in everyone. For healthy people, this clears up within the normal 30-minute window. But the American Thoracic Society has warned that even a single exposure can weaken your respiratory defenses, making you more susceptible to bronchitis or pneumonia in the days that follow.
Though rare, serious complications including collapsed lung and air leaking under the skin have been documented after acute airway inflammation from pepper spray. The overall fatality risk sits around 0.03 percent, but that number climbs for vulnerable populations.
Who Faces the Greatest Danger
Children, older adults, and anyone with asthma or COPD face significantly heightened danger from even brief exposure. At least one death directly linked to pepper spray has been reported in a person with a history of asthma. The airway inflammation that a healthy person shakes off in half an hour can trigger a severe asthma attack or respiratory failure in someone whose airways are already compromised.
Enclosed spaces multiply the risk for everyone. When the spray can’t dissipate into open air, you inhale a much higher concentration for a longer period. Fatalities from chemical irritants are disproportionately associated with exposure in confined areas or at close range over extended periods.
Reviews of in-custody deaths where pepper spray was used have found that the primary causes of death were typically positional asphyxia (being restrained in a position that prevents breathing), drug intoxication, or a condition called excited delirium. Whether pepper spray directly caused those deaths or simply added physiological stress to an already dangerous situation remains debated, but the combination of breathing difficulty from the spray plus physical restraint is clearly a high-risk scenario.
Stream, Fog, and Gel: Does Format Matter?
Pepper spray comes in three main delivery formats, and they differ in how quickly and broadly the effects hit.
- Stream shoots a narrow liquid line, similar to a household spray bottle on its stream setting. It has the longest range, the least blowback risk in wind, and keeps the spray concentrated on the target. It requires more accurate aim.
- Fog (cone) disperses a wide mist that’s nearly impossible to dodge. The tradeoff is shorter range, higher risk of the spray drifting back toward the user in windy conditions, and more contamination of the surrounding area. The mist also lingers in the air longer.
- Gel minimizes airborne contamination but is significantly slower to take effect. The capsicum is suspended in the gel and takes one to three minutes to work into the eyes and mucous membranes. It can also be wiped off before it fully activates, especially on wet or sweaty skin.
For the person being sprayed, fog delivers the fastest, most widespread effect because the fine mist is immediately inhaled and coats the eyes. Stream concentrates the dose on a smaller area but penetrates the eyes deeply. Gel is the least immediately painful but still causes the same symptoms once it activates.
How to Decontaminate After Exposure
If you’re sprayed, the single most important thing you can do is get to fresh air and start flushing your eyes and skin with clean water or saline. Irrigation helps the capsicum break down faster and is the recommended first step for both skin and eye decontamination. Chemical irritant wipes (like Sudecon wipes) can also be used on affected skin and eyes when available.
Baby shampoo mixed with water is a popular home remedy, but studies show it works no better than plain water. Don’t rub your eyes or face, as this grinds the oily residue deeper into your skin and can transfer it to areas that weren’t originally affected. Remove contaminated clothing as soon as possible, since the oil will keep irritating any skin it touches.
Most people won’t need medical attention. But if your vision doesn’t start clearing after 30 to 45 minutes, if you’re having significant trouble breathing, or if you have asthma or another lung condition, you should seek medical care. Delayed irrigation is specifically linked to worse eye outcomes, so the faster you flush, the lower your risk of lasting damage.