Phensedyl LR Oral Suspension is used to treat dry cough. It contains Levocloperastine which works by blocking the cough receptor present in the brain known to cause cough. In some cases, this medicine may cause side effects such as nausea, drowsiness, dizziness, dry mouth, fainting, fatigue, and headache. Inform the doctor if you are pregnant or breastfeeding, taking any other medication, or have any pre-existing medical conditions.