Heat Warning from Public Health Sudbury | Jun 23, 2025

There is currently a Heat Warning for most of Ontario, including: Sudbury, West-Nipissing, French River, Espanola, Massey, Killarney, and Manitoulin Island.

The combination of heat and substances, including medications, can have escalating effects on symptoms experienced. For example, many medications can have a dehydrating effect and increase body temperature. Please remember the following:

  • If you experience heat illness symptoms during extreme heat, immediately move to a cool place and drink liquids. Water is best.
    Symptoms of heat illness include dizziness, fainting, nausea, vomiting, headache, rapid breathing, extreme thirst, and decreased urination with unusually dark yellow urine.
  • Drink plenty of cool liquids, especially water, before you feel thirsty to decrease your risk of dehydration. Thirst is not a good indicator of dehydration.
    If possible, visit a cool place for a few hours, it could be a tree-shaded area, swimming facility, or an air-conditioned spot such as a public building, shopping mall, grocery store, place of worship, or public library.
  • Frequently check-in on friends and family to make sure they are cool and hydrated.

To support you we are sharing two relevant resources:

  • Supporting people who use substances during extreme heat events in English and French
  • Acute Care During Extreme Heat in English and French

Please share these resources widely to help raise awareness and reduce the risk of drug poisonings and related harms.

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Information provided by Public Health Sudbury.