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General Medication Fact Sheet for Timolol
| Field | Information |
|---|---|
| Generic Name | Timolol |
| Brand Name Versions | Blocadren (oral), Timoptic (eye drops) |
| Boxed/Label Warning | Cardiovascular Risks: May cause bradycardia, hypotension, heart failure, and bronchospasm. Use caution in patients with asthma, COPD, or heart conditions. |
| Purpose | Used to treat hypertension, migraine headaches, and glaucoma (eye drops) |
| Mechanism of Action | Non-selective beta-adrenergic receptor blocker, reducing heart rate and blood pressure, and decreasing aqueous humor production in the eye. |
| Dosage Forms | Oral tablets, eye drops |
| Available Strengths | Oral: 5mg, 10mg, 20mg; Eye Drops: 0.25%, 0.5% |
| Dosage Frequency | Oral: Typically twice daily; Eye Drops: Typically twice daily, or as directed by a healthcare provider |
| Common Side Effects | Dizziness, fatigue, weakness, slow heartbeat, cold hands and feet, eye irritation (eye drops) |
| Serious Side Effects | Shortness of breath, swelling of ankles/feet, chest pain, severe dizziness, fainting, allergic reactions |
| Drug Interactions | Other beta-blockers, calcium channel blockers (e.g., verapamil, diltiazem), digoxin, certain antidepressants (SSRIs), insulin, oral diabetes medications |
| Important Notes | Do not stop taking this medication abruptly without consulting your doctor. May mask symptoms of hypoglycemia. Use caution when driving or operating machinery. |
| Storage | Store at room temperature away from moisture and light. Keep eye drops tightly closed and protected from light. |
| Missed Dose | Take as soon as you remember; skip if it’s almost time for your next dose. Do not double the dose. |
| Alternatives | Metoprolol, Propranolol, Atenolol, Latanoprost (for glaucoma) |
Timolol Alternatives
| Medication | Mechanism of Action | Notes |
|---|---|---|
| Metoprolol (Lopressor, Toprol XL) | Selective beta-1 adrenergic receptor blocker | Primarily affects the heart; may be preferred for patients with lung conditions. |
| Propranolol (Inderal) | Non-selective beta-adrenergic receptor blocker | Also used for anxiety and tremor. |
| Atenolol (Tenormin) | Selective beta-1 adrenergic receptor blocker | Longer half-life compared to Metoprolol. |
| Latanoprost (Xalatan) | Prostaglandin analog | Used for glaucoma; lowers intraocular pressure by increasing outflow of aqueous humor. |
Timolol Side Effects
| Common Side Effects | Serious Side Effects |
|---|---|
| Dizziness | Shortness of breath |
| Fatigue | Swelling of ankles/feet |
| Weakness | Chest pain |
| Slow heartbeat | Severe dizziness |
| Cold hands and feet | Fainting |
| Eye irritation (eye drops) | Allergic reactions (rash, itching, swelling, difficulty breathing) |
Timolol Dosage Guide
| Condition | Starting Dose | Maintenance Dose | Administration Notes |
|---|---|---|---|
| Hypertension | 5 mg twice daily | 10-20 mg twice daily | May be taken with or without food. |
| Migraine Prophylaxis | 10 mg twice daily | 10-20 mg twice daily | May be taken with or without food. |
| Glaucoma (eye drops) | One drop in the affected eye(s) twice daily | One drop in the affected eye(s) twice daily | Administer 10 minutes apart from other eye drops, if applicable. |

