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.
Beta Blockers. This includes a group of drugs usually ending in â-olâ, such as atenolol, metoprolol, nebivolol, carvedilol, and bisoprolol. This group of drugs acts primarily by reducing heart rate and the strength of heart contraction. The major use of these drugs was in treating hypertension (previously)and angina.