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As with most drugs, some people can have an allergic reaction after taking Viagra. For more information on the possible side effects of Viagra, talk with your doctor or pharmacist. They can give you tips on how to deal with any side effects that may be concerning or bothersome.
This product may contain inactive ingredients, which can cause allergic reactions or other problems. Rarely, a sudden decrease or loss of hearing, sometimes with ringing in the ears and dizziness, may occur. Stop taking sildenafil and get medical help right away if these effects occur. Vision changes such as increased sensitivity to light, blurred vision, or trouble telling blue and green colors apart may also occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. If this medication upsets your stomach, take it with food or milk.
A side effect is an unwanted response to a medication when it is taken in normal doses. Side effects can be mild or severe, temporary or permanent. Your doctor can give you more information on the safest Viagra dosage for you, including information about factors that can affect your dosage.
Structurally vardenafil (Levitra) is similar to sildenafil, while tadalafil (Cialis) is very different. Vardenafil (Levitra) is almost 10 times more biochemically potent than sildenafil, therefore a lower dose is needed to facilitate the penile erection, potentially resulting in less side effects. Selectivity is the ability of the drug to attach to the specific enzyme PDE 5 found in penile tissues. Vardenafil (Levitra) is more selective than sildenafil and tadalafil (Cialis) to PDE5, which again means a lower dose is needed with potentially less side effects. Tadalafil is very specific for PDE5 and is also very specific for the enzyme PDE11. Unfortunately, we don’t know much about PDE11, which is found in the heart, in the pituitary gland in the brain and in the testicles.
If you want to try a natural or OTC product for ED, you should first discuss it with your doctor. Your Viagra dosage won’t be based on your weight, but it may be based on your age. You can also refer to this in-depth article for details about Viagra’s dosage. For more information about Viagra’s dosage, see this comprehensive article. If you have a severe headache or a headache that won’t go away, call your doctor. They’ll help determine the best treatment for your headache.
Ideally, you should take Viagra about 30–60 minutes before sex for maximum effect. Remember, it won't give you an erection if you are not already sexually aroused. The highest available dose of sildenafil is 100 mg, but that doesn't mean it's the right dose for you.
VIAGRA is supplied as blue, film-coated, rounded-diamond-shaped tablets containing sildenafil citrate equivalent to 25 mg, 50 mg, or 100 mg of sildenafil. Tablets are debossed with PFIZER on one side and VGR25, VGR50 or VGR100 on the other to indicate the dosage strengths. Based on effectiveness and toleration, the dose may be increased to a maximum recommended dose of 100 mg or decreased to 25 mg. Sildenafil is a phosphodiesterase type 5 (PDE-5) inhibitor. It blocks the action of the enzyme PDE-5, which destroys cyclic guanosine monophosphate (cGMP). An increase in cGMP levels leads to relaxation of the smooth muscles in the penis and increased blood flow, which contributes to an erection.
Dr Fox cannot supply ED treatment to men who have any of the above conditions. If erectile dysfunction is the result of spinal injury or operation, nerves might be damaged. In this case Viagra may help a little but other measures, such as injections or stiffening aids, may be required.
A stronger CYP3A4 inhibitor such as ketoconazole or itraconazole could be expected to have greater effect than that seen with saquinavir. The results from this pilot study are shown in Table 3