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.
Drugs that reduce the high blood pressure (antihypertensives), especially alpha 2 receptor agonists, beta-blockers and alpha 1 receptor antagonists are also common causes of extreme fatigue. Drugs that treat abnormal heart rhythm (antiarrhythmic medications) also may cause sedation.