Before you begin using a medication, be sure to inform your doctor of any medical conditions or allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use this medication.
Contact lenses: There are preservatives present in both formulations of timolol eye drops. These preservatives may be absorbed by soft contact lenses. Contact lenses should be removed before using timolol drops and not re-inserted until at least 15 minutes after use.
Diabetes: Beta-blockers such as timolol may mask the signs and symptoms of acute hypoglycemia (low blood sugar). People with diabetes prone to hypoglycemia or who are receiving insulin or hypoglycemic medications should monitor blood glucose regularly.
General: As with other topically applied eye drops, this medication may be absorbed into the blood circulation. The same side effects reported with oral medications from the family known as beta-blockers (e.g., timolol, propranolol, metoprolol) may occur with the eye drops.
Heart failure: People with heart failure should be carefully monitored by their doctors while using timolol eye drops.
Overactive thyroid: Timolol may mask the signs of overactive thyroid. People who have this condition or are prone to developing it should be carefully monitored by their doctors.
Pregnancy: Timolol has not been studied for use by pregnant women. This medication should not be used during pregnancy unless the benefits outweigh the risks.
Breast-feeding: This medication passes into breast milk. If you are a breast-feeding mother and are taking this medication, it may affect your baby. Talk to your doctor about whether you should continue breast-feeding.
Children: Timolol eye drops are not currently recommended for use by children.