Siden du er stor og tung ville jeg tatt 300-400mg og 5-15mg valium. Valiumen øker krampeterskelen og minsker risikoen for kramper.

"Using tramadol together with other narcotic pain or cough medications can lead to serious side effects including seizures, respiratory distress, coma, and even death."
Dette gjelder vel heroin.

https://www.drugs.com/drug-interacti...-0-2221-0.html