http://www.medications.com/effect/view/35912 In July I was prescribed Lisinopril / HCTZ 20 /12.5. Within one week I started to have side effects. These included -pain in chest - worsened with high humidity - trouble breathing - shortness of breath - worsened with high humidity - slight continuous Sun, 07 Dec 2008 09:44:43 -0500 http://www.medications.com/effect/view/35912?item=15094 Could you tell me where you found the information that Lisinopril is based from viper venom? I read that it is based on hymenoptera venom, which is insect (ant, bee) venom. This is found in the prescribing information from Watson Pharmaceutical. http://www.medications.com/effect/view/35912?item=15094 Sun, 31 May 2009 20:39:37 -0400 http://www.medications.com/effect/view/35912?item=20247 I have been on 20 mg of Lisinopril for over a year with no problems. My doctor added the HCTZ 12.5 mg and I immediately started having the dizziness and fainting in any type of heat. Outside, Steam Room, Hot tub....never had that with Lisinopril by its http://www.medications.com/effect/view/35912?item=20247