An Introduction to Clemastine Side Effects
As with any medicine,
clemastine fumarate (
Tavist® Allergy, Dayhist
® Allergy) can cause side effects. However, not everyone who takes the medication will have problems. In fact, some people tolerate it quite well. If side effects do occur, in most cases, they are minor and either require no treatment or can easily be treated by you or your healthcare provider.
(This article covers many, but not all, of the possible side effects with clemastine. Your healthcare provider can discuss a more complete list of clemastine side effects with you.)
Serious Side Effects Seen With Clemastine
Some clemastine side effects are potentially serious and should be reported immediately to your healthcare provider. Although generally rare, some of these side effects may actually be fairly common, particularly in young children or the elderly. These include, but are not limited to:
- Low blood pressure (hypotension)
- Heart palpitations
- A rapid heart rate (tachycardia)
- An irregular heartbeat
- Anemia
- Low blood platelets
- Confusion
- Blurred vision or double vision
- Loss of balance, especially if accompanied by ringing of the ears (tinnitus) or hearing loss
- Seizures
- Difficulty passing urine
- Worsening of ulcers or gastroesophageal reflux disease
- Worsening of glaucoma
- Signs of an allergic reaction, such as:
- An unexplained rash
- Itching
- Hives
- Swelling of the mouth or throat
- Wheezing
- Difficulty breathing.
