Ciprofloxacin tablets and oral suspension for oral administration are available. Ciprofloxacin should be taken at least two hours since you last took ciprofloxacin. Antibiotics work best when the amount of Cipro in your blood. Calcium-based products can dramatically interfere with the absorption of Cipro. Taking large amount of caffeine and can make you very jittery and nervous. Ciprofloxacin is one of the most powerful and versatile antibiotic medications available to treat a multitude of infections.