What causes rapid heart rate and dry mouth?
Patient: Hi I accidentally took 3 Alavert in the span of 18hrs instead of 1 every 24hrs. I have the fast heart rate and dry mouth, but I ve been drinking lots of fluids to flush it out and I puked. Should I still go to the hospital? My fast heart rate has slightly gone down. Doctor: Hi,  Alavert (Loratadine) overdosage is causing tachycardia, dry mouth due to its anti-cholinergic (antimuscarinic) effects.  Its biological half-life is on average 8 hours (range 3 to 20 hours); hence its effect will pass off. Since about 40% of the drug is excreted into the urine, adequate urination with plenty of water by mouth is all that is needed. Visit to a doctor is always is advised in case of overdosage.  Hope I have answered your query. Let me know if I can assist you further.   Regards, Dr. Tushar Kanti Biswas,  Internal Medicine Specialist