Is avil 25 safe during pregnancy?

Avil (Pheniramine) : Is an antihistamine which has anticholinergic effects that is used for allergic conditions. Avil is pregnancy category c. Drugs.Com defines fda category c as “animal reproduction studies have shown an adverse effect on the fetus ; there are no adequate ; well-controlled studies in humans, but potential benefits may warrant use of the drug in pregnant women despite potential risks.”.