The drugs you are taking should generally only be combined under the supervision of a doctor, so if you take any that aren't prescribed, are taking more than prescribed, or are adding in extra recreational drugs, please let us know so we can tell you the risks associated with each. Are you taking additional opioids or did you just mean the dihydrocodeine and morphine?
And by "qutiapine" I assume you meant quetiapine.
Here are the interactions between the drugs you mentioned:
flouxetine
diazepam
quetiapine
dihydrococodeine
morphine sulphate extended release
temazepam
methylphenidate (Concerta)
Interactions:
fluoxetine will increase the level/effect of morphine by affecting hepatic enzyme metabolism. This interaction is considered serious.
fluoxetine + diazepam or dihydrocodeine
fluoxetine will increase the level/effect by affecting hepatic enzyme metabolism. Be careful and take less than usual if you are not used to combining them.
diazepam + temazepam + quetiapine + morphine + dihydocodeine
All of these things are CNS depressants and increase sedation and risk of overdose. Be careful and take less than usual if you are not used to combining them. Be extremely careful taking recreational opioids with these - this is not recommended and can be very dangerous.
methylphenidate - decreases sedation and can mask the effects of the benzos and opioids. May increase the effects of fluoxetine and diazepam.
quetiapine + fluoxetine
Each increases toxcity of the other by prolonging the QT interval. Cases have shown QT prolongation with overdose in patients with concomitant illness or with drugs known to cause electrolyte imbalance or prolong QT. Use caution and don't take other drugs that prolong the QT interval.
Of course a lot of these risks depend on what your tolerance to each drug is, whether you are taking them as prescribed, etc. I need more information in order to be able to help you. Is this list what you normally take every day? If so, for how long? What drugs were you thinking of adding?
