Ritalin (Methylphenidate) is nearly identical to Cocaine in its MOA and nearly twice as potent as Cocaine at inhibiting the DAT dopamine transporter
ED-50 0.25mg of HCL salt / per Kg of body weight ....effective dose to inhibit 50% of DAT
CIBA Pharmaceuticals had a 100mg glass jar of pure Ritalin HCL. Administer 10mg IV and thats a decent dose for an adult male. Oral Ritalin is 20mg tablets X 3 daily (every 3-4 hours) ....when IVed Ritalin is MUCH more potent. As a 240lbs 6' male I usually take 60-70mg IR at once with Alcohol to feel euphoric, no more than that
A medical study with Cocaine dependant users had trouble differentiating the difference between Ritalin and Cocaine via IV injection
In a professional medical study with trained staff I'm sure it's relatively safe regarding dosing, body weight, cardiovascular health, DDI's, etc, etc
Illicit Cocaine of unknown chemical makeup or purity I'd say IV administration is very dangerous. Each batch of illicit Cocaine would have to be slowly tested each time to gauge potency and reaction to each batch
20mg of HCL salt in a 1cc 30 gauge insulin syringe and slowly press in 0.1 ml or even half that...and feel for 30 sec to a min any effects.....slowly press, each 0.1 ml until Cocaine effects are gradually felt.
Again, very dangerous to inject an unknown powder ....I'd send it to "have your drugs tested" if you live in Canada.
You're playing with fire....