Last Editorial Review: 6/11/2021
Other Name(s):

Dew Plant, Drosera, Droséra, Drosera anglica, Droséra à Feuilles Rondes, Drosera intermedia, Drosera longifolia, Droséra à Longues Feuilles, Drosera ramentacea, Drosera rotundifolia, Drosère, Lustwort, Red Rot, Rocío del Sol, Rossolis d'Angleterre, Round-Leafed Sundew, Youthwort.


Sundew is an herb. The dried plant is used to make medicine.

People take sundew as a tea for various breathing problems including bronchitis, asthma, whooping cough (pertussis), windpipe infections (tracheitis), coughing fits, and dry cough. They also take it for stomach ulcers and cancer.

How does it work?

Sundew seems to help break up chest congestion by thinning mucous and making it easier to cough up (as an expectorant). It also reduces spasms.


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Uses & Effectiveness

Insufficient Evidence to Rate Effectiveness for...

More evidence is needed to rate the effectiveness of sundew for these uses.

Natural Medicines Comprehensive Database rates effectiveness based on scientific evidence according to the following scale: Effective, Likely Effective, Possibly Effective, Possibly Ineffective, Likely Ineffective, and Insufficient Evidence to Rate (detailed description of each of the ratings).

Side Effects

Sundew is POSSIBLY SAFE for most people when taken by mouth.


Next to red peppers, you can get the most vitamin C from ________________. See Answer

Special Precautions & Warnings

Pregnancy and breast-feeding: There is not enough reliable information about the safety of taking sundew if you are pregnant or breast-feeding. Stay on the safe side and avoid use.


The appropriate dose of sundew depends on several factors such as the user's age, health, and several other conditions. At this time there is not enough scientific information to determine an appropriate range of doses for sundew. Keep in mind that natural products are not always necessarily safe and dosages can be important. Be sure to follow relevant directions on product labels and consult your pharmacist or physician or other healthcare professional before using.

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Report Problems to the Food and Drug Administration

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Amagase, S. Digestive enzymes in insectivorous plants. 3. Acid proteases in the genus Nepenthes and Drosera peltata. J Biochem 1972;72(1):73-81. View abstract.

Bienenfeld, W. and Katzlmeier, H. [Flavonoids from Drosera rotundifolia L.]. Arch Pharm Ber.Dtsch Pharm Ges. 1966;229(7):598-602. View abstract.

Budzianowski, J. Naphthoquinone glucosides of Drosera gigantea from in vitro cultures. Planta Med. 2000;66(7):667-669. View abstract.

Darnowski, D. W., Carroll, D. M., Plachno, B., Kabanoff, E., and Cinnamon, E. Evidence of protocarnivory in triggerplants (Stylidium spp.; Stylidiaceae). Plant Biol (Stuttg) 2006;8(6):805-812. View abstract.

Didry, N., Dubreuil, L., Trotin, F., and Pinkas, M. Antimicrobial activity of aerial parts of Drosera peltata Smith on oral bacteria. J.Ethnopharmacol. 1998;60(1):91-96. View abstract.

Ferreira, D. T., Andrei, C. C., Saridakis, H. O., Faria, Tde J., Vinhato, E., Carvalho, K. E., Daniel, J. F., Machado, S. L., Saridakis, D. P., and Braz-Filho, R. Antimicrobial activity and chemical investigation of Brazilian Drosera. Mem.Inst Oswaldo Cruz 2004;99(7):753-755. View abstract.

Kamarainen, T., Uusitalo, J., Jalonen, J., Laine, K., and Hohtola, A. Regional and habitat differences in 7-methyljuglone content of Finnish Drosera rotundifolia. Phytochemistry 2003;63(3):309-314. View abstract.

Kolodziej, H., Pertz, H. H., and Humke, A. Main constituents of a commercial Drosera fluid extract and their antagonist activity at muscarinic M3 receptors in guinea-pig ileum. Pharmazie 2002;57(3):201-203. View abstract.

KRAHL, R. [An active substance isolated from Drosera rotundifolia.]. Arzneimittelforschung. 1956;6(6):342-348. View abstract.

KRAHL, R. and GORDONOFF, T. [An active principle from Drosera rotundifolia and its pharmacology.]. Helv.Physiol Pharmacol.Acta 1955;13(2):C17-C19. View abstract.

Krenn, L., Beyer, G., Pertz, H. H., Karall, E., Kremser, M., Galambosi, B., and Melzig, M. F. In vitro antispasmodic and anti-inflammatory effects of Drosera rotundifolia. Arzneimittelforschung. 2004;54(7):402-405. View abstract.

Krolicka, A., Szpitter, A., Maciag, M., Biskup, E., Gilgenast, E., Romanik, G., Kaminski, M., Wegrzyn, G., and Lojkowska, E. Antibacterial and antioxidant activity of the secondary metabolites from in vitro cultures of Drosera aliciae. Biotechnol Appl Biochem 9-9-2008; View abstract.

Luckner, R. and Luckner, M. [Naphthoquinone derivatives from Drosera ramentacea Burch. ex Harv. et Sond]. Pharmazie 1970;25(4):261-265. View abstract.

Marczak, L., Kawiak, A., Lojkowska, E., and Stobiecki, M. Secondary metabolites in in vitro cultured plants of the genus Drosera. Phytochem.Anal. 2005;16(3):143-149. View abstract.

Mativandlela, S. P., Meyer, J. J., Hussein, A. A., Houghton, P. J., Hamilton, C. J., and Lall, N. Activity against Mycobacterium smegmatis and M. tuberculosis by extract of South African medicinal plants. Phytother.Res. 2008;22(6):841-845. View abstract.

Melzig, M. F., Pertz, H. H., and Krenn, L. Anti-inflammatory and spasmolytic activity of extracts from Droserae herba. Phytomedicine. 2001;8(3):225-229. View abstract.

Murali, P. M., Rajasekaran, S., Paramesh, P., Krishnarajasekar, O. R., Vasudevan, S., Nalini, K., Lakshmisubramanian, S., and Deivanayagam, C. N. Plant-based formulation in the management of chronic obstructive pulmonary disease: a randomized double-blind study. Respir Med 2006;100(1):39-45. View abstract.

Okabe, T., Mori, H., and Ohyama, T. Deoxyribonuclease secreted from an insectivorous plant Drosera adelae. Nucleic Acids Symp Ser. 1997;(37):127-128. View abstract.

Okabe, T., Yoshimoto, I., Hitoshi, M., Ogawa, T., and Ohyama, T. An S-like ribonuclease gene is used to generate a trap-leaf enzyme in the carnivorous plant Drosera adelae. FEBS Lett 10-24-2005;579(25):5729-5733. View abstract.

Paper, D. H., Karall, E., Kremser, M., and Krenn, L. Comparison of the antiinflammatory effects of Drosera rotundifolia and Drosera madagascariensis in the HET-CAM assay. Phytother.Res 2005;19(4):323-326. View abstract.

Plachno, B. J., Adamec, L., Lichtscheidl, I. K., Peroutka, M., Adlassnig, W., and Vrba, J. Fluorescence labelling of phosphatase activity in digestive glands of carnivorous plants. Plant Biol (Stuttg) 2006;8(6):813-820. View abstract.

Ramanamanjary, W. and Boiteau, P. [Protective activity effect of Mahatanando, Drosera ramentacea Burch, in relation to bronchospasm]. C.R.Acad.Sci.Hebd.Seances Acad.Sci.D. 4-22-1968;266(17):1787-1789. View abstract.

Vinkenborg, J., Sampara-Rumantir, N., and Uffelie, O. F. [Rossoliside, a glycoside from Drosera rotundifolia L]. Pharm.Weekbl. 4-3-1970;105(14):414. View abstract.

Vinkenborg, J., Sampara-Rumantir, N., and Uffelie, O. F. [The presence of hydroplumbagin glucoside in Drosera rotundifolia L]. Pharm.Weekbl. 1-17-1969;104(3):45-49. View abstract.

Wang, Q., Shu, J., and Zeng, L. [Chemical constituents of Drosera peltata Smith var. lunata (Buch.-Ham.) C.B. clarke collected in Tibet]. Zhongguo Zhong.Yao Za Zhi. 1998;23(11):683-4, 704. View abstract.