Name: Timolol

Forms of Medication

Timolol is available in the following forms:

  • Ophthalmic Gel
  • Ophthalmic Solution
  • Oral Tablet

What happens if I miss a dose?

Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.

Timolol side effects

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have:

  • new or worsening chest pain;

  • slow or uneven heartbeats;

  • a light-headed feeling, like you might pass out;

  • shortness of breath (even with mild exertion), swelling, rapid weight gain;

  • muscle weakness;

  • drooping eyelids, vision problems; or

  • a cold feeling in your hands and feet.

Common side effects may include:

  • trouble breathing;

  • dizziness;

  • nausea, upset stomach;

  • feeling tired; or

  • itching.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Precautions While Using timolol

It is very important that your doctor check your progress at regular visits to make sure timolol is working properly and to check for unwanted effects .

Timolol may cause heart failure in some patients. Check with your doctor right away if you are having chest pain or discomfort; dilated neck veins; extreme fatigue; irregular breathing; an irregular heartbeat; shortness of breath; swelling of the face, fingers, feet, or lower legs; weight gain; or wheezing .

timolol may cause changes in your blood sugar levels. Also, timolol may cover up signs of low blood sugar, such as a rapid pulse rate. Check with your doctor if you have these problems or if you notice a change in the results of your blood or urine sugar tests .

Make sure any doctor or dentist who treats you knows that you are using timolol. You may need to stop using timolol several days before having surgery .

Timolol Description

Timolol maleate is a nonselective beta-adrenergic receptor blocking agent. The chemical name for Timolol maleate is (S)-1-[(1,1-dimethylethyl)amino]-3-[[4-(4-morpholinyl)-1,2,5-thiadiazol-3-yl]oxy]-2-propanol (Z)-2-butenedioate (1:1) salt. It possesses an asymmetric carbon atom in its structure and is provided as the levo isomer. Its molecular formula is C13H24N4O3S•C4H4O4 and its structural formula is:

Timolol maleate has a molecular weight of 432.50. It is a white, odorless, crystalline powder which is soluble in water, methanol, and alcohol.

Timolol maleate is supplied as tablets containing 5 mg, 10 mg and 20 mg Timolol maleate for oral administration. Inactive ingredients are: colloidal silicon dioxide, croscarmellose sodium, magnesium stearate, microcrystalline cellulose, pregelatinized starch, sodium lauryl sulfate, FD&C Blue #2 aluminum lake, and D&C Yellow #10 aluminum lake.

Other Comments

Storage requirements:
-Consult the manufacturer product information.

Reconstitution/preparation techniques:
-Consult the manufacturer product information.

IV compatibility:
-Consult the manufacturer product information.