While taking cephalexin capsules, avoid alcohol, as it may increase side effects like dizziness or nausea. Don’t take cephalexin capsules with probiotics or antacids without consulting a doctor, as they can reduce effectiveness. Avoid skipping doses or stopping early, even if symptoms improve, to prevent antibiotic resistance. Be cautious with cephalexin capsules if you have allergies to penicillin or other antibiotics, as cross-reactivity may occur. Avoid taking cephalexin capsules alongside medications like metformin or blood thinners without medical advice, as interactions can happen. Lastly, steer clear of driving if cephalexin capsules cause drowsiness or confusion, and always follow your doctor’s instructions.