From the Research
Caffeine may provide limited relief for some hangover symptoms, but it is not a comprehensive solution and should be used with caution due to its diuretic effects. When considering the use of caffeine to alleviate hangover symptoms, it's essential to weigh the potential benefits against the risks. Caffeine can help reduce headaches by constricting blood vessels and blocking adenosine receptors that cause pain, and may temporarily counteract fatigue 1. However, as a diuretic, caffeine can worsen dehydration, a key factor in hangovers.
To use caffeine safely in the context of a hangover, limit intake to 100-200mg (one cup of coffee), consume plenty of water alongside it, and consider pairing it with an over-the-counter pain reliever like ibuprofen (200-400mg) for better headache relief. The most recent and highest quality study on the effects of caffeinated vs. non-caffeinated alcoholic beverages on hangover incidence and severity found no significant effects on hangover incidence or severity, but did note improvements in perceived sleep quality and morning alertness 1.
For overall hangover recovery, it's crucial to focus primarily on rehydration with water and electrolyte-containing beverages, eating easily digestible foods, and getting adequate rest. Caffeine works best for mild symptoms and as part of a broader recovery approach rather than as a standalone remedy, as it doesn't address the underlying causes of a hangover such as inflammation and metabolic disturbances from alcohol breakdown. Given the potential for caffeine to exacerbate dehydration, a key component of hangovers, its use should be approached with caution and as part of a comprehensive strategy for managing hangover symptoms, rather than relying solely on caffeine for relief.