In Deus Ex, medkits are single-use item that takes 1 inventory space and can be stacked up to 15. A medkit can be used from the tool belt, in the inventory, or in the "Health" interface in the Datavault. Number of HP restored relies on the agent's Medicine skill, and it can heal 30, 60, 75 or 90 health points.
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In Deus Ex: Invisible War, medkits vary from their previous versions - they cannot be used instantly. Using a medkit will display first-person animation of the player injecting the medkit in his veins and then healing is received.