Guduchi or Giloy is a famous Ayurvedic herb, used extensively in treatment.
Giloy – medicinal properties  –
Rasa – Taste – Kashaya (Astringent), Tikta (Bitter)
Vipaka – Taste conversion after digestion – Madhura – sweet
Guna – qualities – Laghu – Light to digest, Snigdha – Oily, Unctuous.
Veerya – Potency – Ushna – Hot
Effect on Tridosha – Doshatrayahara – Balances Tridoshas – Vata, Pitta and Kapha.
uses:
Rasayani – Rejuvenative
Sangrahini – brings about absorptive nature to stomach and intestines, useful in malabsorption syndrome, diarrhoea.
Balya – improves strength
Agnideepani – Improves digestion power
Amahara – relieves Ama – indigestion
Trut hara – relieves excessive thirst (as seen in fever)
Dahahara – relieves burning sensation in the body. Note that though Guduchi is Hot in potency, it helps to relieve burning sensation. This action is brought about by its Madhura Vipaka. (Sweet after-taste). Sweetness is coolant in nature.
Mehahara – useful in treatment of diabetes, urinary tract disorders.
Kasahara – Useful to relieve cough
Paunduhara – relieves anemia
kamala – Useful in treatment of jaundice and related diseases of liver
Kushta – Useful in skin diseases
Vatasra – Vatarakta – Useful in gout-arthritis
Jvara – Useful in fever. 90 % of Ayurvedic medicines for fever contain Guduchi as an essential ingredient.
Krimihara – useful to relieve intestinal worms.
Vamihara – useful to relieve vomiting.
Prameha – useful in diabetes and urinary tract disorders
Shwasa – useful in difficulty in breathing, (dyspnoea), asthma, Bronchitis
kasa – Cough, cold
Arsha – Piles, hemorrhoids
Krichra – Difficulty in passing urine
Hrudya, Hrudroga – Vatanut – Useful in heart diseases with Vata symptoms such as pain.
Chakshushya – improves vision, good for eyes, useful in eye disorders
Vayasthapana – anti aging, rejuvenating
Vrushya – Aphrodisiac
Dosage:
If it is Guduchi powder – 500 mg of powder – 2 times a day, mixed along with a teaspoon of honey – once or twice a day, after food is the dose.
If it is Guduchi capsule, (extract), then 250 mg capsule  one per day can be given for the child, after food.
It can be continued for a period for 2- 3 months based on need.