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Side Effects of Timolol (Blocadren, Timoptic)


Side Effects of Timolol (Timoptic)

Timolol, known as the brand Timoptic, it is used in the treatment of a number of conditions including myocardial heart attack, migraine, glaucoma and hypertension.

Common Side Effects

The Timoptic label reported by the FDA lists the common side effects:


  • Burning or stinging eyes
  • Blurred or abnormal vision
  • Conjunctival hyperemia (eye discharge)
  • Unusual body sensations
  • Keratitis (inflammation of the cornea)
  • Conjunctivitis (pink eye)
  • Cataracts (clouding of the lens)
  • Decreased visual acuity
  • Hypertension (high blood pressure)
  • Headache

Less Common Side Effects

Rare side effects of Timoptic are: fatigue, myalgia (muscle pain), hepatomegaly (increased liver size), hypoglycemia (decreased blood glucose concentration), hyperglycemia (increased blood glucose concentration), anorexia, nausea, diarrhea, dyspepsia (indigestion), dry mouth, abdominal pain, and alopecia (hair loss) (Timoptic label reported by the FDA).

About Pharmacogenetic Testing

Some patients do not develop any side effects when taking Timoptic while others experience severe adverse reactions. Pharmacogenetics investigates how differences in patient’s genetics can affect the therapeutic and adverse effects of a drug. Many studies have shown that alleles of receptors and enzymes result in different effects for patients. Therefore, there are different medication reactions between patients.


Identifying these polymorphisms can help clinical decision-making. For instance, a physician might reduce the dosage of a medication in a known poor metabolizer that will reduce the probability of the patient developing an adverse reaction.

Know Your Risk with the Rxight® Genetic Test

MD Labs provides Rxight®, which identifies known polymorphisms in 18 crucial genes to establish how a patient is likely to respond to hundreds of common prescription and over-the-counter (OTC) medications including Timoptic.


Call us to learn more about Rxight® pharmacogenetic testing, at 1-888-888-1932 or email us at support@Rxight.com.


Contributors to this Article:
Michael Sapko, MD, PhD; and Deborah Kallick, PhD, Medicinal Chemistry

Read more about Rxight® Genetic Testing for Medications