Histacon is a cold and flu capsule combining paracetamol, chlorphenamine, caffeine and phenylephrine. It treats several symptoms at once — aches and fever, sneezing and runny nose, and a blocked nose. It contains paracetamol, so do not take other paracetamol-containing products with it.

What is Histacon?

Histacon is registered in South Africa as a Schedule 2 capsule, available from a pharmacist:

Contains	Per capsule	Role
Paracetamol	200 mg	Pain and fever
Chlorphenamine	2 mg	Sedating antihistamine — sneezing, runny nose
Caffeine	30 mg	Mild stimulant
Phenylephrine	5 mg	Decongestant — blocked nose

Four ingredients, four different jobs — which is the appeal of a combination product and also its main drawback.

Paracetamol relieves the aches, sore throat and fever. Note the 200 mg strength, which is lower than a standard 500 mg paracetamol tablet.
Chlorphenamine is a first-generation antihistamine. It reduces sneezing and a runny nose, and dries secretions — but it crosses into the brain and causes marked drowsiness, unlike newer antihistamines such as loratadine.
Caffeine is included as a mild stimulant, said to enhance pain relief and offset some of the antihistamine’s sedation.
Phenylephrine is a decongestant, narrowing blood vessels in the nasal lining to reduce swelling. Its effectiveness taken by mouth is genuinely debated — regulators have reviewed the evidence and several have concluded that oral phenylephrine is no better than placebo for nasal congestion. Pseudoephedrine, found in products such as Decofed, has better evidence.

The central trade-off with any combination product: you take all four ingredients whether or not you need all four. If your only symptom is a blocked nose, you are also taking paracetamol, an antihistamine and caffeine unnecessarily — and the paracetamol is the one that matters most, because it limits what else you can safely take.

What is Histacon commonly used for?

Cold and flu symptoms, where several occur together.
Aches, pains and fever from a cold or flu.
Sneezing and a runny nose.
Nasal and sinus congestion.
Sore throat discomfort.
Hay fever symptoms, in some cases.

It treats symptoms, not the illness. It has no effect on the virus behind a cold and does not shorten it. Most colds settle within a week to ten days regardless.

It is intended for short-term use — a few days. Ongoing symptoms need a different approach, and the decongestant and antihistamine are not suitable for prolonged use.

How Histacon fits into this medicine category

Group	Examples	Notes
Combination cold and flu	Histacon, and many others	Several ingredients; convenient but inflexible
Simple analgesics	Paracetamol	Aches and fever alone
Sedating antihistamines	Chlorphenamine, promethazine	Sneezing, runny nose; drowsiness
Non-sedating antihistamines	Loratadine, cetirizine	Allergy without sedation
Oral decongestants	Pseudoephedrine, phenylephrine	Blocked nose
Nasal sprays	Oxymetazoline, saline	Fast local relief; limit sprays to 3–5 days
Mucolytics	Acetylcysteine, bromhexine	Thin mucus in chesty coughs

Treating only the symptoms you actually have is usually the better approach, since it avoids unnecessary ingredients and lets you adjust each one. See the allergy, cold, flu and respiratory medicines hub.

What to check before using Histacon

Check every other product you take for paracetamol. This is the most important point. Cold and flu remedies, sinus products, and painkillers frequently contain it, and taking Histacon alongside one of them means taking paracetamol twice — the most common route to serious accidental overdose.

Do not take another antihistamine or decongestant at the same time.

Do not drink alcohol with it. Alcohol adds to the drowsiness and increases the risk of liver harm from paracetamol.

Speak to a pharmacist or doctor first if you:

Have high blood pressure, heart disease, angina or an irregular heartbeat — the decongestant can raise blood pressure.
Have an overactive thyroid, or diabetes.
Have glaucoma, particularly narrow-angle.
Have prostate enlargement or difficulty passing urine — both the antihistamine and the decongestant can worsen this.
Have liver disease, or drink heavily.
Have kidney disease.
Weigh under 50 kg, which reduces the maximum safe paracetamol amount.
Have epilepsy, or asthma or COPD.
Are elderly, where sedation, confusion, falls and urinary retention are more likely.
Are pregnant or breastfeeding.
Are giving it to a child. Combination cold products are not recommended in young children — ask a pharmacist.
Take an MAOI antidepressant — this must be avoided with the decongestant, including for two weeks after stopping one.
Take warfarin, blood pressure medicines, tricyclic antidepressants, or any other sedating medicine.

Do not drive or operate machinery until you know how it affects you.

Possible cautions and when to ask a pharmacist or doctor

Common effects are drowsiness, dry mouth, dizziness, blurred vision, constipation, restlessness and difficulty sleeping — the antihistamine sedates while the caffeine and decongestant stimulate, which many people find an uncomfortable combination.

Stop and seek medical attention if you develop:

Chest pain, a fast or irregular heartbeat, or severe palpitations — seek emergency care for chest pain.
A severe headache, particularly with visual disturbance.
Inability to pass urine.
Marked confusion, agitation or hallucinations, particularly in an older person.
Eye pain with blurred vision or halos — possible acute glaucoma, an emergency.
Swelling of the face, lips or tongue, or difficulty breathing.
A severe rash, blistering or peeling skin.
Restlessness or excitability instead of drowsiness, a recognised paradoxical reaction more common in children.

Paracetamol overdose is a medical emergency and does not feel like one at first. Someone who has taken too much may feel entirely well for a day or more while liver damage develops silently. Go to an emergency department immediately with the packaging if too much has been taken — even accidentally, even if the person seems fine.

See a doctor rather than continuing if:

Symptoms last more than about a week, or worsen.
You have a high or persistent fever, or fever returning after improvement.
You have breathlessness, wheezing or chest pain.
You have facial pain, thick discoloured discharge and fever, suggesting a sinus infection.
You are coughing up blood.
You have unintended weight loss or night sweats with a persistent cough — in South Africa these warrant prompt assessment for tuberculosis.
Ear pain or hearing loss develops.
You have a stiff neck with severe headache, or a rash that does not fade when pressed — seek urgent care.

Related medicine guides

Frequently asked questions

What are Histacon capsules used for? Cold and flu symptoms — aches and fever, sneezing and runny nose, and nasal congestion. Each capsule contains paracetamol, chlorphenamine, caffeine and phenylephrine.

Is Histacon an antibiotic? No. It relieves symptoms and has no effect on infection. Colds and flu are viral.

Does it make you drowsy? The chlorphenamine causes drowsiness, though the caffeine and decongestant can also make it hard to sleep. Do not drive until you know how it affects you.

Can I take paracetamol with it? No. It already contains paracetamol, and doubling up risks serious overdose. Check other cold remedies too.

Does the decongestant actually work? Oral phenylephrine’s effectiveness is debated, and several regulators have concluded it is no better than placebo for nasal congestion. A nasal spray or pseudoephedrine has better evidence.

Can I give it to my child? Combination cold products are not recommended in young children. Ask a pharmacist.

Can I take it with high blood pressure? Ask a pharmacist first. The decongestant can raise blood pressure.

How long can I take it? A few days at most. Symptoms lasting more than about a week need a doctor.

What Is Histacon Used For?