Smelling salts are ammonia-based chemical compounds used to jolt someone into greater alertness, most famously after fainting or right before a heavy lift in sports.

What smelling salts are

  • Smelling salts are usually made from ammonium carbonate or diluted ammonia mixed with water and sometimes ethanol and perfume.
  • They are also called ammonia inhalants , aromatic spirits of ammonia , or sal volatile in medical and historical texts.
  • The solid or liquid slowly releases ammonia gas into the air once opened or exposed.

How they work (the quick science)

  • When you open the bottle or crush the capsule, ammonium carbonate or dilute ammonia breaks down and releases ammonia gas.
  • The sharp ammonia fumes irritate the mucous membranes in the nose and lungs, which triggers an automatic “inhalation reflex.”
  • This reflex causes a deeper, faster breath, boosting airflow and oxygen delivery, and can increase heart rate and subjective alertness for a short time.

In simple terms: the burn in your nose forces a big, sudden inhale, which briefly wakes the nervous system up.

What they’re used for today

  • Historically, smelling salts were used to “revive” people who fainted or felt faint, especially in the Victorian era.
  • Modern emergency medicine rarely relies on them; instead, they are more common in sports , especially strength sports and some contact sports, as a fast stimulant before a maximal effort.
  • They are typically used for seconds at a time and the perceived effect—feeling “hyped” or more focused—usually lasts under a minute.

Safety, risks, and limits

  • In low, occasional doses at a short distance from the nose, smelling salts are generally considered safe for most healthy adults.
  • Overuse or very close exposure can cause burning in the nose and throat, watery eyes, headaches, nausea, or nosebleeds.
  • People with asthma, chronic lung disease, or eye problems are usually advised to avoid them or use them only under medical guidance.
  • They do not treat underlying medical problems like concussion, low blood pressure, or serious fainting causes; those still need proper medical evaluation.

Quick Scoop (TL;DR)

  • Smelling salts = ammonia-based stimulants that release pungent fumes.
  • They work by irritating nasal and lung membranes, triggering a big involuntary inhale and brief spike in alertness.
  • Now mostly used in sports or out of habit, not as a core medical treatment.
  • Short, sensible use is typically safe, but they can irritate airways and are not a fix for serious health issues.

Information gathered from public forums or data available on the internet and portrayed here.