Hydrochlorothiazide had no adverse effects on the fertility of mice and rats of either sex in studies wherein these species were exposed, via their diet, to doses of up to 100 and mg kg day, respectively, prior to mating and throughout gestation. AV Block: Lopressor slows AV conduction and may produce significant first- P-R interval Signs and Symptoms Potential signs and symptoms associated with overdosage with Lopressor are bradycardia, hypotension, bronchospasm, and cardiac failure. You will need to discuss the benefits and risks of using Lopressor while you are pregnant. After oral administration of 25- to 100-mg doses, 72-97 buy lopressor without perscription of the dose is excreted in the urine, indicating dose-independent absorption. Oral maintenance therapy with Lopressor or placebo was then continued for months. Because of its relative beta1-selectivity, however, TOPROL-XL may be used with caution in patients with bronchospastic disease who do not respond to, or cannot tolerate, other antihypertensive treatment.