Labetalol Pregnancy Warnings -Animal studies have failed to reveal evidence of teratogenicity, although an increased incidence of fetal resorption was demonstrated in some studies at doses approximating the maximum recommended human dose. Along with its needed effects, labetalol (the active ingredient contained in Trandate) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention. SIDE EFFECTS. Most adverse effects are mild and transient and occur early in the course of treatment. In controlled clinical trials of 3 to 4 months' duration, discontinuation of Trandate (labetalol) Tablets due to one or more adverse effects was required in 7% of all patients. Find patient medical information for Labetalol Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. for labetalol hydrochloride The use of labetalol in maternal hypertension is not known to be harmful, except possibly in the first trimester. If labetalol is used close to delivery, infants should be monitored for signs of alpha-blockade (as well as beta blockade). Labetalol can mask early warning symptoms of hypoglycemia (low blood sugar) such as tremors and increased heart rate which are the result of activation of the adrenergic nervous system. Labetalol oral tablet (Trandate) is used to treat high blood pressure (hypertension). Learn about side effects, warnings, dosage, and more. Learn about side effects, warnings, dosage, and more. Before taking Labetalol during pregnancy, consult your doctor or pharmacists to weigh the risks and benefits. Pregnancy is the time when you need to stay in good health and keep all complications at bay. It is a well-known fact that Labetalol is considered effective for lowering high blood pressure during pregnancy, but one must remain very careful about its probable side effects as well. Find information about common, infrequent and rare side effects of Labetalol Oral.