I don't have detail on QUADMIX or TRIMIX these are not available in Australia. Having said that, BE VERY CAREFUL buying over the counter injectibales. There are many drugs that can be used that will give and erection. The drugs that you need are subject to your personal medical condition and the medications you use. eg Heart medications, Diabeties medications, Athritis medications just to name a few dictate which combination will work for you. The possibility of getting Priapism from unsupervised injections can lead you to a very painful and life-threatenning situation. Consult a Urologist or a medical group that specialises in male erectile dysfunction. Properly prescribed and managed injections are no problem and the erection ...brilliant and long lasting. It will be a question who will have the biggest smile on their face you or your partner. Good luck and happy shagging!