Turning the medspray into a support item that only heals teammates instead of yourself will help improve teamwork instead of people spamming it for personal use.
Consumable - Triggers the spray of an advanced compound around you that immediately triggers health regeneration for friends and foes alike. You get the added benefit of doubling your base healt regeneration.
Immediately starts health regeneration for all players within 5m
Doubles base health regeneration for 5 seconds
Consumable - Triggers the spray of an advanced compound around you that increases health regeneration for allies.
Passively increases health regeneration for allies within 5m for 5 seconds
This way the player will get a slight health regeneration boost, not enough to restart a gunfight, not enough to be abused or play solo with and players will coordinate their consumables to aid this. A passive heal seems like the best option for an item like this. So it doesn't INSTANTLY heal your teammates, but it heals them a tiny bit faster for a short period of time.