Yes, the anti-emetic, the H2 blocker and SN.
Well, then depends on what you think wise is. These don't interact in any dangerous way once they're mixed inside your body (Apart from letting the SN kill you, of course).
I saw people worried for Tagamet but it's strictly necessary taking it?
Also, what happens if I accidentaly exceed the 15g amount?
And how I know I'm taking the exact dosage? (I have nothing for calculatung it)
Tagamet's the least necesary part for this method, but it's still better to have it, and it's OTC. If you can't get it for some reason, consider taking a spoon of bicarbonate or something
Most reports I've seen are of people who've taken over 15g (from 20 to 30) and they don't really mention anything special.
You don't have and can't buy a scale? If not, try comparing your dose to the total amount you have (25g should be 25% of a 100g bottle, for example).
Is there a way to test the sn if you got the right stuff and if its pure enough?
Like a testkit?
Not to my knowledge. Who did you buy it from? If you're really sared try to weight it in a precision scale and see if the density matches up to online data.
I have a bottle of vererinary nembutal (6.3g). I plan to take it with SN. I have strong prescription anti-emetics. Do you think the nembutal will block the SN or vice versa? I hope these drugs dont interact.
Checked some sources, looks like N will cause some dizziness with the Meto. Apart from that, N and SN don't seem to have any notable interaction.
Is it possible to overdo the dosage? I am less concerned with peacefulness and more worried about actually dying from it. I would rather not fail from taking too little.
Don't overdo it too much. Most people use more than 15g, but I don't know if taking a whole bottle would be smart. Take 20 if you're a healthy adult and are unsure if 15 will be enough, but don't go overboard too much with it.