re doxazosin how safe are they?

As far as I am aware, doxazosin is considered relatively safe.

The most common side effects are dizziness and postural hypotension (feeling faint when getting up suddenly from a sitting or lying position.)

The dose may be started off low to avoid these side effects, then gradually increased. It is also recommended that the first few doses are taken at bedtime - and continued if the doxazosin makes you feel dizzy or light-headed. Make sure you are careful getting out of bed in the morning.