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
Answer is 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.