Post-e-Kunain (Sinchona)

What is Post-e-Kunain (Sinchona)?

Post-e-Kunain is the dried bark of the cinchona tree (Cinchona officinalis). It is also called cinchona bark. Unani and Persian healers use it for fever with chills, for weak appetite, and as a bitter tonic.

This is not a mild kitchen herb. The bark is the source of quinine, the first drug that worked against malaria. The gap between a helpful dose and a harmful one is small.

Here is the short verdict. Pure quinine has been tested in people for many years and is a licensed medicine. The raw bark has not been tested that way.

Long use in a tradition is not proof that a remedy works. That holds here.

Because the bark carries drug-strength compounds, we treat it as a high-risk item. It can thin the blood, upset the heartbeat, drop blood sugar and damage the kidneys. People have died from too much quinine.

Read the safety part of this page before you read anything else about doses.

How does Post-e-Kunain (Sinchona) work?

The bark holds quinine and other alkaloids (strong plant compounds). Quinine kills the parasite that causes malaria. That part is well proven, but it was proven with the pure drug, not with bark tea.

The bark is also very bitter. In Unani thought, a bitter taste wakes up the stomach and helps clear a 'cold' fever. Bitter taste does seem to raise saliva and gut juices in people, but how much that helps digestion is not clear.

Quinine also acts on muscle cells. It makes them slower to fire. That is the idea behind its old use for leg cramps.

One more point matters. The amount of quinine in bark shifts from tree to tree and batch to batch. So the strength of any home-made bark drink is hard to guess.

What forms does Post-e-Kunain (Sinchona) come in?

You may see it as rough bark pieces or as a fine brown powder.

Other common forms are a decoction (bark boiled in water) and a tincture (a liquid extract made with alcohol). Unani shops also sell mixed pills and syrups that contain the bark.

Pure quinine tablets are a licensed medicine, not a herbal product. They are made to a set strength. Bark products are not.

Tonic water holds a tiny amount of quinine as a flavour. That amount is set by food law and is far below a medicine dose.

Where it comes from:

The cinchona tree grows in the Andes of South America. Quechua people used the bark long before Europeans arrived. Jesuit priests carried it to Europe in the 1600s, where it was called Jesuit's bark.

Traders moved it east along the same routes as spices and cloth. Persian and Unani doctors took it up as a fever bark and kept the name kunain.

By the 1800s it was a standard fever drug in Unani practice and in Europe alike. It is a late arrival in these books, but a deeply rooted one.

What does Post-e-Kunain (Sinchona) help with?

• Malaria fever: This is the one real, proven use, and it belongs to pure quinine rather than to bark tea. Quinine drawn from this bark is a licensed malaria medicine used around the world. Unani texts list the bark for the same purpose. But you cannot dose bark safely at home. Malaria is a medical emergency. Get tested and treated by a doctor.
• Fever with chills and shivering: Tradition rates this highly. Persian and Unani writers used the bark for fevers that come in waves with cold shakes. We found no human trials of the bark for general fever. Many fevers are not malaria, and the bark does nothing for those. A fever that lasts more than three days needs a doctor, not bark.
• Poor appetite and weak digestion: This is the gentlest traditional use. A very small dose of the bitter bark was given before meals to wake up the stomach. Bitter plants do raise saliva and gut juices. But safer bitters exist, and they do not carry quinine. We would not pick this bark for appetite.
• Night-time leg cramps: Quinine was used for years for night cramps in the legs. Reviews of those trials suggest a small drop in how often cramps come. Drug safety agencies in the United States and Europe later advised against it for cramps. The reason is the risk of low platelets (blood cells that help clotting) and bleeding. The small benefit was judged not worth that risk.
• Tiredness while getting over an illness: Old Unani and European practice used bitter bark wines as a tonic after fever. This is traditional standing only. We found no trials that test the bark for tiredness or recovery. Rest, food and fluids do this job without risk.

What are the side effects of Post-e-Kunain (Sinchona)?

• Ringing in the ears and dulled hearing
• Headache and dizziness
• Blurred sight or trouble seeing colour
• Nausea, vomiting and loose stools
• Flushing and sweating
• Skin rash and itching
• Low platelets (blood cells that help clotting), leading to easy bruising and bleeding
• Bleeding from the gums or nose, or blood in urine or stool
• Low blood sugar, with shaking, sweating and confusion
• Fast, slow or uneven heartbeat
• Breakdown of red blood cells, which can turn urine dark
• Kidney injury, shown by passing much less urine
• Severe allergic reaction, with swelling and trouble breathing
• Loss of sight in heavy poisoning
• Death from overdose

Good to know:

Mild effects are common. Ringing ears, headache, sick stomach and blurred sight together are called cinchonism, and they are the body's early warning that the dose is too high.

The serious effects are rarer but they are not freak events. Low platelets and bleeding can start after a single small dose in someone who reacts badly. Quinine overdose can stop the heart or take a person's sight for good.

Stop the bark at the first sign of ringing ears, easy bruising or a change in your vision.

Options to discuss with a clinician

For each of the reasons people reach for cinchona bark, there are routes that have been studied properly — and every one of them starts as a conversation with a doctor or pharmacist rather than a straight swap.

**Fever with chills, or suspected malaria.** Any fever with shaking chills after travel to a malaria area is an emergency: same-day assessment, a blood test that confirms or rules out the parasite, and prescribed antimalarial treatment matched to the species and your medical history. A clinician can also find the other causes of fever that look identical.

**Night-time leg cramps.** Worth raising with a GP or pharmacist, who can check for causes such as medicines you already take, circulation problems, nerve issues or low thyroid function, and talk through stretching and sleep-position approaches that have been trialled.

**Poor appetite and weak digestion.** Ask a clinician to look for a reason — reflux, medication side effects, low mood, thyroid or dental problems — before anything is added. A registered dietitian can help if eating has dropped off.

**Tiredness after illness.** A doctor can check blood count, iron, thyroid and glucose, and advise on a graded return to activity.

If you want a traditional approach, a qualified Unani practitioner working alongside your doctor can discuss what fits safely.

Graded pages for the options named above:

• Stretching — evidence grade A, traditional tier T3