“Antibiotics tested for potential block of Ca++ uptake included the aminoglycosides neomycin and streptomycin , the lincosamide clindamycin, oxytetracycline and polymyxin B. Drugs were applied in concentrations ranging from 1 to 1000 microM. Uptake of 45Ca was determined during depolarization induced by an elevated K+ concentration (77.5 mM).”