The NHS website

Medicines A to Z

Find out how your medicine works, how and when to take it, possible side effects and answers to your common questions.

Find out about health conditions, including their symptoms and how they're treated.

NHS medicines information on verapamil – what it's used for, side effects, dosage and who can take it.

NHS medicines information on varenicline – what it’s used for, side effects, dosage and who can take it.

NHS medicines information on trazodone – what it's used for, side effects, dosage and who can take it.

NHS medicines information on trastuzumab – what it's used for, side effects, dosage and who can have it.

NHS medicines information on topiramate – what it's used for, side effects, dosage and who can take it.

NHS medicines information on tolterodine – what it's used for, side effects, dosage and who can take it.

NHS medicines information on tiotropium inhalers – what they're used for, side effects, dosage and who can use them.

NHS medicines information on thiamine – what it's used for, side effects, dosage and who can take it.