Here's something to think about and you definitely want a chemist to sort it out...
Medicinal drugs are actually stronger than you need but they are made that way because humans produce an enzyme that filters/blocks out various things in concert with the liver to ensure we don't poison ourselves. That is to say, it will reduce the potency of the medication.
However, grapefruit and a very small number of other citrus fruits produce a chemical that effectively shuts down the enzyme and allows the full strength of the medicinal drug to interact with the body.
It's the specific reason some medicines state "do not consume grapefruit while using this medicine".
One small glass of grapefruit juice can amp up the effect of the medicine to produce toxicity and you know, if you're really unlucky, kill you... apparently it has happened
And the effects don't just go away after a few hours, it can take up to a full day for the grapefruit effect to diminish to safe levels.
So, what the hell am I blathering on about?
Imagine then, your group of PCs stumble across a group of people who they have been told are drug runners. If their cargo is searched they have large quantities of grapefruit (or the juice).
Why?
Because they have a chemist who is producing doses of grapefruit juice to enhance the effect of the drugs they are selling which means they can reduce the potency of the drug and therefore sell smaller doses and thus have more product to sell.
Or if you don't want to walk in the shades of grey, perhaps a medical doctor somewhere has limited supplies of medical drugs and has rediscovered the grapefruit effect. They have decided that this is a convenient way to make more medicine available but...
There's always a but.
They need someone to source grapefruit for them.
Perhaps one of your PCs with Chemistry can attempt to stretch out the group's medical drugs by using them in concert with grapefruit juice?
"So how did the Twilight: 2000 game go today?"
"Yeah, interesting but a little strange."
"Strange?"
"Yeah, the Ref has sent us on a trek to Turkey to find grapefruit"
For your researching needs should you want to mess with your game group!
https://www.healthline.com/nutrition...h-medications?
https://www.drugs.com/article/grapef...eractions.html
https://en.wikipedia.org/wiki/Grapef...g_interactions
https://www.fda.gov/consumers/consum...drugs-dont-mix
Ah the weird and wonderful things we can find when we're doing a bit of research for gaming!
