Guanethidine is used in the treatment of which of the following condition?

Guanethidine is used in the treatment of which of the following condition?
a) Thyrotoxic ophthalmopathy
b) Ptosis
c) Bell’s palsy
d) Horner’s syndrome
Correct Answer - A
Guanethidine (10%) eye drops is useful in decreasing lid retraction in Thyrotoxic ophthalmopathy.
It is an adrenergic neuron blocker which acts by inhibiting the release of noradrenaline in response to
nerve stimulation.