The following side effects are associated with ondansetron HCl:

Common side effects of ondansetron HCl:

• DiarrheaLess Severe
• DrowsinessLess Severe
• FeverLess Severe
• Head PainLess Severe
• Incomplete or Infrequent Bowel MovementsLess Severe

Infrequent side effects of ondansetron HCl:

• DizzyLess Severe
• Feeling WeakLess Severe
• Low EnergyLess Severe
• RashLess Severe

Rare side effects of ondansetron HCl:

• Abnormal Heart Electrical SignalsSevere
• Abnormal Liver Function TestsSevere
• Abnormally Low Blood PressureSevere
• Acute Liver FailureSevere
• BronchospasmSevere
• Decreased Oxygen In The Tissues Or BloodSevere
• Extrapyramidal ReactionSevere
• Fast HeartbeatSevere
• Giant HivesSevere
• Life Threatening Allergic ReactionSevere
• Prolonged Q-T Interval on EKGSevere
• ShockSevere
• Slow HeartbeatSevere
• Stevens-Johnson SyndromeSevere
• Temporary BlindnessSevere
• Toxic Epidermal NecrolysisSevere
• Trouble BreathingSevere
• Very Rapid Heartbeat - Torsades de PointesSevere
• Vocal Cord SwellingSevere
• AnginaLess Severe
• AnxiousLess Severe
• Blurred VisionLess Severe
• Cannot Empty BladderLess Severe
• Dry MouthLess Severe
• Feeling RestlessLess Severe
• Heart Throbbing or PoundingLess Severe
• HiccupsLess Severe
• HivesLess Severe
• ItchingLess Severe
• Numbness and TinglingLess Severe