I'm pretty sure a large batch of generic bupropion XR had to be pulled off the shelves in the USA because of dose-dumping which resulted in multiple patients having tonic-clonic seizures. Let's not forget, tonic-clonic seizures kill.
It's the case that both act primarily on the VMAT2 transport and I actually identified that the two bind to different sites within that transport so potentially activity isn't additive but tending towards multiplicative.
There are numerous confounding factors and everyone on BL is just a little picture and a name. So consider it as a total stranger telling you it's just fine to take two different medications that have the potential to kill.
We use the term 'survivorship' bias more broadly to mean that people tend to report positive experiences more often than they post negative experiences, but in this case, the words mean what they say.
I have yet to read a 'trip report' including the words 'and then I died'. Extreme, but it's not like it hasn't happened here with friends and family posting onto the BL Shrine.
I admit that I had forgotten that bupropion also a negative allosteric modulator of some of the nictonic receptors but lest we forget, nicotine itself is a toxin and it's mode of toxicity is, you guessed it - seizures.
It is true that occassionally specialists will proscribe the two medications concurrently but thing such as age, gender, body mass and known comorbities will all be taken into account. Typically a clinicial will reduce the dose of bupropion if it's prescribed as an 'add on'. But it's always based on the metric of the benefits outweigh the risks and even then patientls WILL have the known risks spelled out to them.
I suppose you have to take the time to read the appropriate papers to estimate but one more thing about stimulants is that they can produce insomnia or at best provide poor quality sleep and insomnia and sleep debt also lower a person's seizure threshold. The problem is, without testing, how close to that threshold a person is cannot be guaged.