Antihistamines are more likely to cause dizziness , sedation , and hypotension in elderly patients.
No mutagenic studies have been conducted with clemastine fumarate. This effect was not found at 156 times the adult human dose. Pregnancy Teratogenic Effects. Oral reproduction studies performed with clemastine fumarate in rats and rabbits at doses up to 312 and 188 times the adult human doses respectively, have revealed no evidence of teratogenic effects. There are no adequate and well-controlled studies of clemastine fumarate in pregnant women.