St. Johns wort

  • Overview


Information specific to: St. Johns wort.

About St. Johns wort and how it works

This medicine is a traditional herbal medicine which helps relieve low mood and anxiety. It contains a mixture of ingredients which help relieve these symptoms.

This medicine is available in the form of tablets which are taken by mouth.

If you are about to undergo surgery, you should stop taking this medicine at least 10 days before surgery.

This medicine can make your skin sensitive to sunlight. You should try to avoid exposing your skin to ultraviolet light such as sunlight, solarium or sunbeds while you are taking this medicine.

Consult your doctor if your symptoms do not improve after six weeks or if they get worse during treatment with this medicine.

Before using St. Johns wort

This medicine may not be suitable for everyone and some people must never have it. Check the leaflet that comes with your medicine to make sure that the medicine is suitable before having it.

Always get advice from a healthcare professional before taking this medicine if:

  • you are allergic or sensitive to or have had a reaction to any of the ingredients in the medicine
  • this medicine is for someone under 18 years of age
  • you have photosensitive skin
  • you are suffering from depression
  • you are undergoing light therapy
  • you have an intolerance to sugars
  • you are about to undergo surgery in the next 10 days

Medicines interactions:

If you are taking more than one medicine they may interact with each other. Before taking this medicine consult your doctor or pharmacist if you are taking or have recently taken any other medicines including vitamins, mineral supplements and herbal or complementary preparations.

The following medicines may interact with this medicine:

  • hormonal contraceptives
  • hormone replacement therapies
  • medicines for depression such as amitriptyline, clomipramine, moclobemide, citalopram, escitalopram, fluoxetine, fluvoxamine, paroxetine, sertraline, duloxetine and venlafaxine
  • medicines for thinning blood such as warfarin and acenocoumarol
  • medicines for epilepsy such as carbamazepine, phenobarbitone, phenytoin, primidone and sodium valproate
  • immunosuppressant medicines such as cyclosporin and tacrolimus
  • medicines for HIV infections such as amprenavir, atazanavir, darunavir, fosamprenavir, indinavir, lopinavir, nelfinavir, ritonavir, saquinavir, tipranavir, efavirenz, nevirapine and delavirdine
  • cholesterol lowering medicines such as atorvastatin and simvastatin
  • medicines for cancer such as irinotecan, dasatinib, erlotinib, imatinib, sorafenib, sunitinib, etoposide and mitotane
  • medicines for heart problems such as digoxin, ivabradine and amiodarone
  • medicines for migraines such as almotriptan, eletriptan, frovatriptan, naratriptan, rizatriptan, sumatriptan and zolmitriptan
  • medicines for high blood pressure such as amlodipine, nifedipine, felodipine and verapamil
  • medicines for mood regulation such as lithium
  • thyroid hormones such as thyroxine
  • fentanyl, propofol, sevoflurane and midazolam (anaesthetics or pre-operative medicines)
  • tramadol (a painkiller)
  • erythromycin, clarithromycin and telithromycin (antibiotics)
  • itraconazole and voriconazole (antifungals)
  • artemether and lumefantrine (antimalarials)
  • rasagiline (an anti-Parkinson’s medicine)
  • aripiprazole (an antipsychotic medicine)
  • buspirone (an anxiolytic)
  • aprepitant (a medicine used to treat post-operative vomiting)
  • butobarbital and phenobarbital (barbiturates)
  • methyl phenidate (a central nervous system or CNS stimulant)
  • exemestane (a hormonal antagonist)
  • eplerenone (a diuretic)
  • lansoprazole and omeprazole (proton pump inhibitors)
  • theophylline (a bronchodilator)
  • gliclazide (an antidiabetic medicine)

Possible side effects of St. Johns wort

Most medicines can cause some side-effects but not everyone having the same medicine will get the same side-effects.

The following side-effects have been associated with people having this medicine:

  • allergic skin reactions such as rash, hives or itching - stop taking this medicine immediately if you get an allergic reaction
  • gastrointestinal problems such as indigestion, loss of appetite, nausea, diarrhoea, constipation - stop taking this medicine if these symptoms are persistent
  • tiredness
  • nerve pain or tingling sensation
  • anxiety
  • dizziness
  • mania
  • sunburn-like reactions - these may happen in people who are fair-skinned and expose their skin to ultra-violet light such as the sun or solarium

Pregnancy and breast-feeding

Do not take this medicine if you are trying to become pregnant, are pregnant or are breast-feeding.

Other important information

Make sure that you read the leaflet that comes with your medicine to check what dose you should take and if there is anything that you need to do if you take more than the recommended dose. If you are in any doubt about whether this medicine is suitable for you, speak to your doctor or pharmacist.

This medicine may affect your ability to drive or operate machinery. Do not drive or operate machinery until you know how this medicine affects you.

Keep all medicines out of the sight and reach of children.

This medicine may be available under brand names including:

Superdrug St. John's wort tablets

Quest St. John's wort tablets

Boots St. John's wort tablets

Health Aid Mega St. John's wort tablets

Health Aid St. John's wort tablets

Tesco St. John's wort tablets

Kira St. John's wort tablets

Kira St. John's wort One a Day tablets

Valupak St. John's wort tablets

Power Health St. John's wort tablets

Numark St. John's wort tablets

Lamberts St. John's wort tablets

Natures Aid St. John's wort tablets

Lloydspharmacy St. John's wort tablets

Premier St. John's wort tablets

Hyperiforce St. John's wort tablets

NatraHerb St. John's wort tablets

Content provided by Datapharm

Printable guides available for this medicine: