The fastest way to complete this quest would be to complete the , as a reward we will receive a to required rooms on Labs map. In this quest you will also need to find stimulants,
but this quest is easier to complete. We buy an access key card to Labs, go to the black room. All the stimulants we need will spawn on the floor, chairs, stands and couches.

You can complete to barter a black card from the mechanic. Less reliable ways to find stimulants:
- farm Sanitar and his goons;
- loot Scav players or play as a Scav yourself (player Scavs have a chance to spawn with required stims); 
- use red flares to call an airdrop, hoping that it will be a medical one.

These were general tips. Now let's go through each syringe. 
M.U.L.E., 3-(b-TG), Meldonin: At the Lighthouse behind USEC rogues' base there is a laboratory in the ship-cargo containers; loot Medical Bags.
Obdolbos: Woods medicine spawns such as Emercom(Scav Base), USEC camp or main hangar at the sawmill.
AHF1-M: Most people have problems with this stimulant, alas, but it does not have any simple spawn spots. Labs or Sanitar is the way to go.
P22: as a reward for the Colleagues quest. Part 2, or relate to the general tips.
L1 (Norepinephrine): Tagilla, lucky spawns at the lighthouse, laboratory at the lighthouse