Benzonatate (Tessalon) Dosage. Benzonatate comes in 100 milligram (mg) and 200 mg capsules, and is taken up to a maximum of three times a day, depending on your prescription.Taking more benzonatate than you are prescribed can be very dangerous. Always take benzonatate with a full glass of water and swallow the capsule whole.enzonatate (Tessalon) Dosage. Benzonatate comes in 100 milligram (mg) and 200 mg capsules, and is taken up to a maximum of three times a day, depending on your prescription.