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BMJ (Clinical Research Ed.)|January 19, 2002
Randomised controlled trial of butterbur and cetirizine for treating seasonal allergic rhinitisAndreas Schapowal, Complementary Medicine Research|January 13, 2026
[Off-Label-Anwendungen standardisierter Ginkgo-biloba-Extrakte]Andreas SchapowalComplementary Medicine Research|August 28, 2025
[Long COVID, Post-COVID-Syndrom: Langzeitfolgen von SARS-CoV-2-Infektionen und Nutzen von Ginkgo biloba]Andreas SchapowalWiener Medizinische Wochenschrift (1946)|December 25, 2012
Efficacy and safety of Echinaforce® in respiratory tract infectionsAndreas SchapowalArchives of Otolaryngology--Head & Neck Surgery|December 22, 2004
Butterbur Ze339 for the treatment of intermittent allergic rhinitis: dose-dependent efficacy in a prospective, randomized, double-blind, placebo-controlled studyAndreas Schapowal, Phytotherapy Research : PTR|August 23, 2005
Treating intermittent allergic rhinitis: a prospective, randomized, placebo and antihistamine-controlled study of Butterbur extract Ze 339Andreas Schapowal, Advances in Therapy|March 19, 2015
Echinacea reduces the risk of recurrent respiratory tract infections and complications: a meta-analysis of randomized controlled trialsAndreas Schapowal, Peter Klein, Sebastian L JohnstonEuropean Journal of Medical Research|September 15, 2009
Echinacea/sage or chlorhexidine/lidocaine for treating acute sore throats: a randomized double-blind trialAndreas Schapowal, D Berger, P Klein, et al.Advances in Respiratory Medicine|June 25, 2025
Efficacy and Safety of <i>P. hybridus</i> Leaf Extract Ze 339 for the Treatment of Allergic RhinitisVerena M Merk, Georg Boonen, Veronika Butterweck, et al.Rhinology|April 23, 2009
Treatment of acute rhinosinusitis with the preparation from Pelargonium sidoides EPs 7630: a randomized, double-blind, placebo-controlled trialClaus Bachert, Andreas Schapowal, Petra Funk, et al.Pageof 2