The bloodshot appearance is due to the irritation and dilation of the surface blood vessel in the eye. Other symptoms can accompany the red appearance, like itching, soreness, discharge and even blurred vision. These symptoms could indicate a more serious problem.
The list of possible medications or substances mentioned in sources as possibe causes of Heart block includes: 1  Beta-adrenergic blockers. 2  Digitalis. 3  Flecainide. Flecatab. 4  Flumadine. Quinidine. 5  Rimantidine. Tambocor.
AV nodal blocking agents (i.e. beta blockers, calcium channel blockers, digoxin, adenosine) should be avoided in patients with an irregular wide complex tachycardia. If the rhythm is pre-excited atrial fibrillation, these drugs may cause a paradoxical increase in the heart rate (ventricular response).