|Trade names||Betimol, Istalol, others|
|By mouth, topical (eye drop)|
|Drug class||Beta blocker|
|Elimination half-life||2.5–5 hours|
|CompTox Dashboard (EPA)|
|Chemical and physical data|
|Molar mass||316.42 g·mol−1|
|3D model (JSmol)|
Timolol is a beta blocker medication used either by mouth or as eye drops. As eye drops it is used to treat increased pressure inside the eye such as in ocular hypertension and glaucoma. By mouth it is used for high blood pressure, chest pain due to insufficient blood flow to the heart, to prevent further complications after a heart attack, and to prevent migraines.
Common side effects with the drops is irritation of the eye. Common side effects by mouth include tiredness, slow heart beat, itchiness, and shortness of breath. Other side effects include masking the symptoms of low blood sugar in those with diabetes. Use is not recommended in those with asthma, uncompensated heart failure, or COPD. It is unclear if use during pregnancy is safe for the baby. Timolol is a non-selective beta blocker.
Timolol was patented in 1968, and came into medical use in 1978. It is on the World Health Organization's List of Essential Medicines. Timolol is available as a generic medication. In 2017, it was the 146th most commonly prescribed medication in the United States, with more than four million prescriptions.
In its by mouth or oral form, it is used:
In its eye drop form it is used to treat open-angle and, occasionally, secondary glaucoma. The mechanism of action of timolol is probably the reduction of the formation of aqueous humor in the ciliary body in the eye. It was the first beta blocker approved for topical use in treatment of glaucoma in the United States (1978). When used by itself, it depresses intraocular pressure (IOP) 18–34% below baseline within first few treatments. However, there are short-term escape and long-term drift effects in some people. That is, tolerance develops. It may reduce the extent of diurnal IOP curve up to 50%. IOP higher during sleep. Efficacy of timolol in lowering IOP during the sleep period may be limited. It is 5–10× more potent β blocker than propranolol. Timolol is light-sensitive; it is usually preserved with 0.01% benzalkonium chloride (BAC), but also comes BAC-free. Can also be used in adjunctive therapy with pilocarpine or carbonic anhydrase inhibitors.
On the skin
The medication should not be taken by individuals with:
- An allergy to timolol or any other beta-blockers
- Asthma or severe chronic obstructive bronchitis
- A slow heart rate (bradycardia), or a heart block
- Heart failure
The most serious possible side effects include cardiac arrhythmias and severe bronchospasms. Timolol can also lead to fainting, congestive heart failure, depression, confusion, worsening of Raynaud's syndrome and impotence.
For ophthalmic use, timolol is also available combined:
- with carbonic anhydrase inhibitors:
- with α2 agonists:
- with prostaglandin analogs:
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