Herb in Thai notifiable formulas
Plai
ไพล · Phlai
Zingiber montanum (J. König) Link. ex A. Dietr.
- Family
- Zingiberaceae
- Part used
- rhizome
- Crude drug
- Zingiberis Montani Rhizoma
- In the announcement
- Used in 31 notifiable formulas (10 as capsules)
Thai Herbal Pharmacopoeia (THP)
Constituents and quality criteria of Plai
Summarised from the Zingiber Montanum Rhizome monograph of the Thai Herbal Pharmacopoeia, Department of Medical Sciences, the standard used to test the dried rhizome.
The pharmacopoeia sets no minimum marker content for this herb. Use the raw material quality criteria below for acceptance testing.
Constituents
Zingiber Montanum Rhizome contains cyclohexene derivatives, viz., cis -3-(3,4-dimethoxyphenyl)-4-[( E )-3,4-dimethoxystyryl]cyclohex -1-ene, cis -3-(2,4,5-trimethoxyphenyl)-4-[( E )-2,4,5-trimethoxystyryl]cyclohex-1-ene and cis -3-(3,4dimethoxyphenyl)-4-[( E )-2,4,5 trimethoxystyryl]cyclohex-1-ene; naphthoquinone derivatives, viz., 8-(3,4- dimethoxyphenyl)-2-methoxynaphtho-1,4-quinone; phenylbutanoids, viz., ( E )-4-(3,4- dimethoxyphenyl)but-3-en-1-yl acetate and [( E )-4-(3,4-dimethoxyphenyl)]but-3-en-1-ol; vanillin; vanillic acid; veratric acid; curcumin; β -sitosterol; volatile oil consisting of α -pinene, β -pinene, sabinene, myrcene, α -terpinene, limonene, γ -terpinene, p -cymene, terpinolene, and terpinen-4-ol.
Raw material quality criteria
| Foreign matter | Not more than 2.0% w/w |
| Total ash | Not more than 9.0% w/w |
| Hexane-soluble extractive | Not less than 3.0% w/w |
| Acid-insoluble ash | Not more than 3.0% w/w |
| Volatile oil | Not less than 2.0% v/w |
Storage: Zingiber Montanum Rhizome shall be kept in well-closed containers, preferably of metal or glass, protected from light and stored in a cool and dry place.
Source: Thai Herbal Pharmacopoeia, Department of Medical Sciences (online edition, accessed 21 October 2026)Read the full THP monograph
Formulas using Plai
31 formulas containing Plai
Select a formula to see its ingredients and indications. Formula names and indications are a reference translation; the Thai announcement is the legal text.
- Ya Prasa Phlai Plai-based formula for menstrual discomfortRelieves menstrual pain
- Ya Fai Pralaikan Postpartum formula for lochia dischargeExpels postpartum lochia during postpartum confinement by the fire (ruean fai), helps the uterus return to its normal state (mot luk khao u)
- Ya Prasa Kanphlu Clove formula for stomach ache and indigestionRelieves abdominal pain, abdominal colic/flatulent discomfort, and fullness and distension from indigestion due to disordered elements (that)
- Ya Lueat Ngam Women's blood formula for menstrual painRelieves menstrual pain, helps menstruation come normally, relieves mutakit (abnormal vaginal discharge)
- Ya Prasa Wan Nang Kham Wild turmeric postpartum formula for lochiaExpels postpartum lochia; helps the uterus return to its normal state (mot luk khao u) in women after childbirth (sold only at licensed premises)
- Ya Kae Ritsiduang Lam Sai Formula for intestinal ritsiduangRelieves intestinal ritsiduang (ritsiduang lam sai) with frequent diarrhea, much gas passed during defecation, sometimes with mucus, causing a feeling of fatigue
- Ya Phasom Thaowan Priang Formula 1 Derris scandens formula for body aches, Formula 1Relieves body aches and pains
- Ya Phasom Thaowan Priang Formula 2 Derris scandens formula for body aches, Formula 2Relieves body aches and pains
- Ya Kasai Sen Formula for body aches and back painRelieves body aches and pains, back pain and lower back pain
- Ya Kae Lom Amphruek Formula for tendon and muscle pain (lom amphruek)Relieves pain along the tendons and muscles, and stiffness or numbness of the hands and feet
- Ya Prasa Phlai Plai-based formula for menstrual discomfortRelieves irregular menstruation or menstruation that is lighter than normal
- Ya Prasa Phlai Plai-based formula for menstrual discomfortRelieves irregular menstruation or menstruation that is lighter than normal
- Ya Prasa Phlai Plai-based formula for menstrual discomfortRelieves irregular menstruation or menstruation that is lighter than normal
- Ya Fai Pralaikan Postpartum formula for lochia dischargeExpels postpartum lochia during postpartum confinement by the fire (ruean fai), helps the uterus return to its normal state (mot luk khao u)
- Ya Fai Pralaikan Postpartum formula for lochia dischargeExpels postpartum lochia during postpartum confinement by the fire (ruean fai), helps the uterus return to its normal state (mot luk khao u)
- Ya Kae Yu Fai Mai Dai Postpartum formula for women who cannot do yu fai (lying by the fire)Expels postpartum lochia, helps the uterus return to its normal state (mot luk khao u)
- Ya Kae Tan Sang Pediatric tan sang formula for diarrheaRelieves diarrhea and stools with mucus and blood due to sang fai (a traditional Thai childhood disorder with white patches in the mouth) and tan sang (a traditional Thai childhood disorder)
- Ya Prasa Kanphlu Clove formula for stomach ache and indigestionRelieves abdominal pain, abdominal colic/flatulent discomfort, and fullness and distension from indigestion due to disordered elements (that)
- Ya Lueat Ngam Women's blood formula for menstrual painRelieves menstrual pain, helps menstruation come normally, relieves mutakit (abnormal vaginal discharge)
- Ya Prakhop Herbal compress for aches and muscle tensionApplied as a compress to reduce pain; helps relax muscles, tendons and joints
- Ya Prasa Wan Nang Kham Wild turmeric postpartum formula for lochiaExpels postpartum lochia; helps the uterus return to its normal state (mot luk khao u) in women after childbirth (sold only at licensed premises)
- Ya Ritsiduang Thang Doen Patsawa Formula for urinary ritsiduang (difficult urination)Relieves urinary tract ritsiduang (ritsiduang thang doen patsawa), which causes difficult urination and urine containing blood or pus
- Ya Kae Ritsiduang Lam Sai Formula for intestinal ritsiduangRelieves intestinal ritsiduang (ritsiduang lam sai) with frequent diarrhea, much gas passed during defecation, sometimes with mucus, causing a feeling of fatigue
- Ya Phasom Thaowan Priang Formula 1 Derris scandens formula for body aches, Formula 1Relieves body aches and pains
- Ya Phasom Thaowan Priang Formula 1 Derris scandens formula for body aches, Formula 1Relieves body aches and pains
- Ya Phasom Thaowan Priang Formula 2 Derris scandens formula for body aches, Formula 2Relieves body aches and pains
- Ya Phasom Thaowan Priang Formula 2 Derris scandens formula for body aches, Formula 2Relieves body aches and pains
- Ya Kasai Sen Formula for body aches and back painRelieves body aches and pains, back pain and lower back pain
- Ya Kasai Sen Formula for body aches and back painRelieves body aches and pains, back pain and lower back pain
- Ya Kae Lom Amphruek Formula for tendon and muscle pain (lom amphruek)Relieves pain along the tendons and muscles, and stiffness or numbness of the hands and feet
- Ya Kae Lom Amphruek Amphat Traditional formula for lom amphruek amphatRelieves paresis and paralysis wind (lom ammaphruek ammaphat)
Development potential
Develop Plai into a product with the TIBD group
In notifiable formulas31 formulasused in multi-herb formulas
THP raw-material criteria5 testsfor acceptance testing before production
Marker with a minimum contentNot setquality is checked with the raw-material criteria
Testing in the groupVISBIOCurcuminoids in Plai testing
Three ways forward 1Notify a listed formula2Adapt it through detailed notification3Develop a Category B herbal medicine or Category C health productSee the development pathway
VISBIO · laboratory in the TIBD group
Curcuminoids in Plai testing
Analytical testing of Plai raw materials and products by VISBIO, the laboratory in our group.
See the VISBIO serviceK-API · manufacturing in the groupExtract and manufacture at K-API
The TIBD group plant licensed by the Thai FDA to manufacture herbal products, so extraction and production stay within the group.
See the K-API plantTIBD · consultationPlan a product with Plai
We check whether your formula qualifies for notification, detailed notification or registration with the Thai FDA, then prepare the filing documents.
Talk to our team on LINE