About diltiazem Who can and cannot take it How and when to take it Side effects Pregnancy, breastfeeding and fertility Taking it with other medicines and herbal supplements Common questions Related conditions Anal fissure Angina High blood pressure (hypertension) Coronary heart disease Heart attack Stroke Raynaud's phenomenon Useful resources Blood Pressure UK: Charity www.bloodpressureuk.org NHS Health Check British Heart Foundation: charity www.bhf.org.uk