[mana]

hi all
on drugs package always it has been written to keep away from light and heat, is it because radical reactions? I mean is it possible to occur radical reaction in room temperature and sun light? and also how a manufacture can define the best expiry date?

[Borek]

Elevated temperature always speeds up decomposition, no matter what the exact mechanism is.

[Enthalpy]

There hasn't already been an expiry date on drugs. Where I lived, Law changed maybe 3 decades ago, forcing the manufacturers to print a date.

Light and heat: many organic compounds, biologic or not, undergo reactions around room temperature, with light or without. Food rots, chlorophyll operates, linseed oil hardens in air, and most plastics get destroyed by sunlight. Among the radical reactions that start at room temperature with light, you may know H₂+Cl₂.

[mana]

There hasn't already been an expiry date on drugs. Where I lived, Law changed maybe 3 decades ago, forcing the manufacturers to print a date.

thanks, which country are you living? it seems very strength to me why the expiry date is not important ? so you mean that expired drugs are not dangerous?

[Enthalpy]

Time alters some drugs, others not. I'd confidently take stable iodine KI stored for 30 years. Putting a expiry date on all of them is exaggerated.

[...] So you mean that expired drugs are not dangerous?

Your health, you decide.

[mana]

Time alters some drugs, others not. I'd confidently take stable iodine KI stored for 30 years. Putting a expiry date on all of them is exaggerated.

[...] So you mean that expired drugs are not dangerous?

Your health, you decide.

thanks and sorry as the last question is there any way to distinguish which drugs will alert with time and which one does not?
I mean for example the mass spectrometry, fragmentation of the chemical structure of drugs can help?